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. Author manuscript; available in PMC: 2013 Nov 27.

Published in final edited form as: Sleep. 2006 Jan;29(1):25–30. doi: 10.1093/sleep/29.1.25

An experimental protocol for an individual subject who experienced the short nights first. Black shading indicates the sleep/dark episodes at night (6 or 9 hours) and optional 3-hour nap zone in the afternoon during the short-nights condition. L refers to delaying bright-light stimulus: four 30-minute bright-light pulses alternating with ordinary room light, starting 2.5 hours after the baseline dimlight melatonin onset and delaying by 1 hour on the second night; D, dim light (< 60 lux) in the laboratory; ↑, the time of dim-light melatonin onset; ↓, the time of dim-light melatonin offset; = at least 10 minutes of outdoor light. For clarity, the phase assessments are shown as starting and ending at 15:00.

Inline graphic — An experimental protocol for an individual subject who experienced the short nights first. Black shading indicates the sleep/dark episodes at night (6 or 9 hours) and optional 3-hour nap zone in the afternoon during the short-nights condition. L refers to delaying bright-light stimulus: four 30-minute bright-light pulses alternating with ordinary room light, starting 2.5 hours after the baseline dimlight melatonin onset and delaying by 1 hour on the second night; D, dim light (< 60 lux) in the laboratory; ↑, the time of dim-light melatonin onset; ↓, the time of dim-light melatonin offset; = at least 10 minutes of outdoor light. For clarity, the phase assessments are shown as starting and ending at 15:00.