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result sql = Effects of caffeine on daytime recovery sleep: A double challenge to the sleep-wake cycle in aging.
Effects of caffeine on daytime recovery sleep: A double challenge to the sleep-wake cycle in aging.
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char = c;code = 99
char = e;code = 101
char = b;code = 98
char = o;code = 111
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = p;code = 112
char = s;code = 115
char = u;code = 117
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = r;code = 114
char = e;code = 101
char = e;code = 101
char = ;code = 32
char = h;code = 104
char = o;code = 111
char = u;code = 117
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = a;code = 97
char = y;code = 121
char = t;code = 116
char = i;code = 105
char = m;code = 109
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = o;code = 111
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = l;code = 108
char = e;code = 101
char = e;code = 101
char = p;code = 112
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = m;code = 109
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = n;code = 110
char = g;code = 103
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char = d;code = 100
char = o;code = 111
char = s;code = 115
char = e;code = 101
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char = o;code = 111
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = h;code = 104
char = o;code = 111
char = u;code = 117
char = r;code = 114
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = a;code = 97
char = y;code = 121
char = t;code = 116
char = i;code = 105
char = m;code = 109
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = o;code = 111
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = l;code = 108
char = e;code = 101
char = e;code = 101
char = p;code = 112
char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = >;code = 62
char = R;code = 82
char = E;code = 69
char = S;code = 83
char = U;code = 85
char = L;code = 76
char = T;code = 84
char = S;code = 83
char = ;code = 32
char = :;code = 58
char = ;code = 32
char = <;code = 60
char = /;code = 47
char = b;code = 98
char = >;code = 62
char = M;code = 77
char = i;code = 105
char = d;code = 100
char = d;code = 100
char = l;code = 108
char = e;code = 101
char = -;code = 45
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = j;code = 106
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
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char = d;code = 100
char = e;code = 101
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = s;code = 115
char = l;code = 108
char = e;code = 101
char = e;code = 101
char = p;code = 112
char = ;code = 32
char = d;code = 100
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = l;code = 108
char = e;code = 101
char = e;code = 101
char = p;code = 112
char = ;code = 32
char = e;code = 101
char = f;code = 102
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = y;code = 121
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = y;code = 121
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = j;code = 106
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = d;code = 100
char = u;code = 117
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = d;code = 100
char = a;code = 97
char = y;code = 121
char = t;code = 116
char = i;code = 105
char = m;code = 109
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = o;code = 111
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = c;code = 99
char = e;code = 101
char = b;code = 98
char = o;code = 111
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = c;code = 99
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = l;code = 108
char = e;code = 101
char = e;code = 101
char = p;code = 112
char = .;code = 46
char = ;code = 32
char = C;code = 67
char = a;code = 97
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = l;code = 108
char = e;code = 101
char = e;code = 101
char = p;code = 112
char = ;code = 32
char = e;code = 101
char = f;code = 102
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = y;code = 121
char = ,;code = 44
char = ;code = 32
char = s;code = 115
char = l;code = 108
char = e;code = 101
char = e;code = 101
char = p;code = 112
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char = d;code = 100
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ,;code = 44
char = ;code = 32
char = s;code = 115
char = l;code = 108
char = o;code = 111
char = w;code = 119
char = -;code = 45
char = w;code = 119
char = a;code = 97
char = v;code = 118
char = e;code = 101
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char = s;code = 115
char = l;code = 108
char = e;code = 101
char = e;code = 101
char = p;code = 112
char = ;code = 32
char = (;code = 40
char = S;code = 83
char = W;code = 87
char = S;code = 83
char = );code = 41
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = R;code = 82
char = E;code = 69
char = M;code = 77
char = ;code = 32
char = s;code = 115
char = l;code = 108
char = e;code = 101
char = e;code = 101
char = p;code = 112
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char = d;code = 100
char = u;code = 117
char = r;code = 114
char = i;code = 105
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char = g;code = 103
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char = a;code = 97
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char = t;code = 116
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char = m;code = 109
char = e;code = 101
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char = r;code = 114
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char = c;code = 99
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char = e;code = 101
char = r;code = 114
char = y;code = 121
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char = s;code = 115
char = l;code = 108
char = e;code = 101
char = e;code = 101
char = p;code = 112
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char = s;code = 115
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char = m;code = 109
char = i;code = 105
char = l;code = 108
char = a;code = 97
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char = l;code = 108
char = y;code = 121
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char = i;code = 105
char = n;code = 110
char = ;code = 32
char = b;code = 98
char = o;code = 111
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = e;code = 101
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char = g;code = 103
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = p;code = 112
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = C;code = 67
char = a;code = 97
char = f;code = 102
char = f;code = 102
char = e;code = 101
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char = n;code = 110
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = s;code = 115
char = o;code = 111
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char = r;code = 114
char = e;code = 101
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = N;code = 78
char = -;code = 45
char = R;code = 82
char = E;code = 69
char = M;code = 77
char = ;code = 32
char = s;code = 115
char = l;code = 108
char = e;code = 101
char = e;code = 101
char = p;code = 112
char = ;code = 32
char = E;code = 69
char = E;code = 69
char = G;code = 71
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = n;code = 110
char = c;code = 99
char = h;code = 104
char = r;code = 114
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char = n;code = 110
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char = z;code = 122
char = a;code = 97
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char = i;code = 105
char = o;code = 111
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char = u;code = 117
char = r;code = 114
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char = n;code = 110
char = g;code = 103
char = ;code = 32
char = d;code = 100
char = a;code = 97
char = y;code = 121
char = t;code = 116
char = i;code = 105
char = m;code = 109
char = e;code = 101
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char = r;code = 114
char = e;code = 101
char = c;code = 99
char = o;code = 111
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = l;code = 108
char = e;code = 101
char = e;code = 101
char = p;code = 112
char = ;code = 32
char = (;code = 40
char = r;code = 114
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char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = d;code = 100
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char = d;code = 100
char = e;code = 101
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char = t;code = 116
char = a;code = 97
char = ,;code = 44
char = ;code = 32
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char = h;code = 104
char = e;code = 101
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char = a;code = 97
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char = ;code = 32
char = a;code = 97
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char = d;code = 100
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char = a;code = 97
char = l;code = 108
char = p;code = 112
char = h;code = 104
char = a;code = 97
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char = p;code = 112
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = t;code = 116
char = a;code = 97
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char = p;code = 112
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = );code = 41
char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = >;code = 62
char = C;code = 67
char = O;code = 79
char = N;code = 78
char = C;code = 67
char = L;code = 76
char = U;code = 85
char = S;code = 83
char = I;code = 73
char = O;code = 79
char = N;code = 78
char = S;code = 83
char = ;code = 32
char = :;code = 58
char = ;code = 32
char = <;code = 60
char = /;code = 47
char = b;code = 98
char = >;code = 62
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
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char = m;code = 109
char = b;code = 98
char = i;code = 105
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char = d;code = 100
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char = f;code = 102
char = l;code = 108
char = u;code = 117
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char = c;code = 99
char = e;code = 101
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char = ;code = 32
char = a;code = 97
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char = e;code = 101
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char = f;code = 102
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char = s;code = 115
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char = a;code = 97
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char = c;code = 99
char = u;code = 117
char = l;code = 108
char = a;code = 97
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char = l;code = 108
char = y;code = 121
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char = v;code = 118
char = u;code = 117
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char = a;code = 97
char = b;code = 98
char = l;code = 108
char = e;code = 101
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char = t;code = 116
char = o;code = 111
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char = t;code = 116
char = h;code = 104
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char = c;code = 99
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char = r;code = 114
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char = a;code = 97
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char = a;code = 97
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char = w;code = 119
char = a;code = 97
char = k;code = 107
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char = s;code = 115
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char = g;code = 103
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = .;code = 46
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char = W;code = 87
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = p;code = 112
char = o;code = 111
char = s;code = 115
char = e;code = 101
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char = t;code = 116
char = h;code = 104
char = a;code = 97
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char = l;code = 108
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = r;code = 114
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char = b;code = 98
char = r;code = 114
char = a;code = 97
char = i;code = 105
char = n;code = 110
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char = s;code = 115
char = y;code = 121
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char = c;code = 99
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char = r;code = 114
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char = i;code = 105
char = z;code = 122
char = a;code = 97
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char = o;code = 111
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char = ;code = 32
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char = u;code = 117
char = e;code = 101
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char = t;code = 116
char = o;code = 111
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char = a;code = 97
char = g;code = 103
char = e;code = 101
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char = c;code = 99
char = a;code = 97
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = i;code = 105
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char = e;code = 101
char = ;code = 32
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char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = s;code = 115
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char = g;code = 103
char = r;code = 114
char = e;code = 101
char = a;code = 97
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char = e;code = 101
char = r;code = 114
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char = d;code = 100
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char = f;code = 102
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = y;code = 121
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char = i;code = 105
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = v;code = 118
char = e;code = 101
char = r;code = 114
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char = i;code = 105
char = d;code = 100
char = i;code = 105
char = n;code = 110
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char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = i;code = 105
char = r;code = 114
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char = a;code = 97
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char = i;code = 105
char = a;code = 97
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char = w;code = 119
char = a;code = 97
char = k;code = 107
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = a;code = 97
char = l;code = 108
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char = y;code = 121
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char = ;code = 32
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char = d;code = 100
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char = ;code = 32
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char = m;code = 109
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char = t;code = 116
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char = l;code = 108
char = e;code = 101
char = e;code = 101
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char = .;code = 46
char = ;code = 32
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char = e;code = 101
char = ;code = 32
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char = e;code = 101
char = ;code = 32
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result sql = BACKGROUND AND OBJECTIVE : Caffeine is the most widely used stimulant to counteract the effects of sleepiness, but it also produces important detrimental effects on subsequent sleep, especially when sleep is initiated at a time when the biological clock sends a strong waking signal such as during daytime. This study compares the effects of caffeine on daytime recovery sleep in young (20-30 y.) and middle-aged subjects (45-60 y.).

METHODS : Subjects participated in both caffeine (200mg) and placebo conditions (double-blind cross-over design), spaced one month apart. For each condition, subjects initially came to the laboratory for a nocturnal sleep episode. Daytime recovery sleep started in the morning after 25h of wakefulness. Subjects were administered either one caffeine (100mg) or placebo capsule three hours before daytime recovery sleep and the remaining dose one hour before daytime recovery sleep.

RESULTS : Middle-aged subjects showed greater decrements of sleep duration and sleep efficiency than young subjects during daytime recovery under placebo compared to nocturnal sleep. Caffeine decreased sleep efficiency, sleep duration, slow-wave sleep (SWS) and REM sleep during daytime recovery sleep similarly in both age groups. Caffeine also reduced N-REM sleep EEG synchronization during daytime recovery sleep (reduced delta, theta, and alpha power, and greater beta power).

CONCLUSIONS : The combined influence of age and caffeine made the sleep of middle-aged subjects particularly vulnerable to the circadian waking signal. We propose that lower brain synchronization due to age and caffeine produces greater difficulty in overriding the circadian waking signal during daytime sleep and leads to fragmented sleep. These results have implications for the high proportion of the population using caffeine to cope with night work and jet lag, particularly the middle-aged.

Publication: Sleep Med. 2009 Oct ;10(9)::1016-24. :doi: 10.1016/j.sleep.2009.01.001.
Publication Date: 2009 Oct
Study Author(s): Carrier, Julie;Paquet, Jean;Fernandez-Bolanos, Marta;Girouard, Laurence;Roy, Joanie;Selmaoui, Brahim;Filipini, Daniel;
Institution: Centre d'étude du sommeil et des rythmes biologiques, Hôpital du Sacré-Coeur de Montréal, Que., Canada. [email protected]
Shortcut link to this study:
BACKGROUND AND OBJECTIVE : Caffeine is the most widely used stimulant to counteract the effects of sleepiness, but it also produces important detrimental effects on subsequent sleep, especially when sleep is initiated at a time when the biological clock sends a strong waking signal such as during daytime. This study compares the effects of caffeine on daytime recovery sleep in young (20-30 y.) and middle-aged subjects (45-60 y.).

METHODS : Subjects participated in both caffeine (200mg) and placebo conditions (double-blind cross-over design), spaced one month apart. For each condition, subjects initially came to the laboratory for a nocturnal sleep episode. Daytime recovery sleep started in the morning after 25h of wakefulness. Subjects were administered either one caffeine (100mg) or placebo capsule three hours before daytime recovery sleep and the remaining dose one hour before daytime recovery sleep.

RESULTS : Middle-aged subjects showed greater decrements of sleep duration and sleep efficiency than young subjects during daytime recovery under placebo compared to nocturnal sleep. Caffeine decreased sleep efficiency, sleep duration, slow-wave sleep (SWS) and REM sleep during daytime recovery sleep similarly in both age groups. Caffeine also reduced N-REM sleep EEG synchronization during daytime recovery sleep (reduced delta, theta, and alpha power, and greater beta power).

CONCLUSIONS : The combined influence of age and caffeine made the sleep of middle-aged subjects particularly vulnerable to the circadian waking signal. We propose that lower brain synchronization due to age and caffeine produces greater difficulty in overriding the circadian waking signal during daytime sleep and leads to fragmented sleep. These results have implications for the high proportion of the population using caffeine to cope with night work and jet lag, particularly the middle-aged.
PMID: 19342294

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