Simulated Dawn Med Students

per3 model of Naturebright It was set at the participants habitual wake time, and automatically began ramping between 30 and 90 minutes prior to that time (based upon participant preference). The ramp increased in a curvilinear fashion, mimicking sunrise during the summer at 45 degrees North latitude and reached a maximum light intensity of 300lux. They were allowed to switch the lamp off during the ramp period, and sleep in on off days, but were asked to allow the light to begin its ramp.

Sleep Hygiene instructions read aloud