The aims of this study are to compare 3 different treatments for circadian adjustment to a laboratory protocol which will mimic westward air travel across 8 time zones. One treatment will involve simply following the new schedule for 3 days. Another treatment will also involve exposure to bright light for 1 hour per day. A third treatment will involve exposure to bright light + exercise for 1 hour per day + consuming a melatonin tablet. Adjustment to the shifted schedule will be assessed by comparing measures of sleep, mood, mental performance, physical performance, and timing of melatonin across the 3 treatment conditions.
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Change (shift) in the acrophase of urinary 6-sulphatoxymelatonin (aMT6s) excretion
Timeframe: 6.5 days
Change (shift) in the acrophase of the rhythm of the median reaction time
Timeframe: 6.5 days
Change in sleep duration
Timeframe: 5 days