Methods
Using an experimental design we photographed the
faces of 23 adults (mean age 23, range 18-31 years, 11
women)between 14.00 and 15.00 under two conditions
in a balanced design: after a normal night’s sleep (at
least eight hours of sleep between 23.00-07.00 and
seven hours of wakefulness) and after sleep deprivation
(sleep 02.00-07.00 and 31 hours of wakefulness). We
advertised for participants at four universities in the
Stockholm area. Twenty of 44 potentially eligible peo-
ple were excluded. Reasons for exclusion were
reported sleep disturbances, abnormal sleep require-
ments (for example, sleep need out of the 7-9 hour
range), health problems, or availability on study days
(themain reason).We also excluded smokers and those
who had consumed alcohol within two days of the pro-
tocol. One woman failed to participate in both condi-
tions. Overall, we enrolled 12 women and 12 men.
Methods
Using an experimental design we photographed the
faces of 23 adults (mean age 23, range 18-31 years, 11
women)between 14.00 and 15.00 under two conditions
in a balanced design: after a normal night’s sleep (at
least eight hours of sleep between 23.00-07.00 and
seven hours of wakefulness) and after sleep deprivation
(sleep 02.00-07.00 and 31 hours of wakefulness). We
advertised for participants at four universities in the
Stockholm area. Twenty of 44 potentially eligible peo-
ple were excluded. Reasons for exclusion were
reported sleep disturbances, abnormal sleep require-
ments (for example, sleep need out of the 7-9 hour
range), health problems, or availability on study days
(themain reason).We also excluded smokers and those
who had consumed alcohol within two days of the pro-
tocol. One woman failed to participate in both condi-
tions. Overall, we enrolled 12 women and 12 men.
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