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Light exposure prior to the temperature nadir results in a delay of circadian rhythms, whereas light exposure after the temperature nadir causes phase advances. Note that there is a dead zone in the middle of the day where bright light exposure has no effect on the timing of circadian rhythms. In contrast, melatonin administered in the beginning of the night advances the circadian rhythm, while melatonin in the morning delays the circadian rhythm.
Light exposure prior to the temperature nadir results in a delay of circadian rhythms, whereas light exposure after the temperature nadir causes phase advances. Note that there is a dead zone in the middle of the day where bright light exposure has no effect on the timing of circadian rhythms. In contrast, melatonin administered in the beginning of the night advances the circadian rhythm, while melatonin in the morning delays the circadian rhythm.
===Dark period===
===Dark period===
{{main|Dark period}}
{{main|Dark period}}
===Daylight lamps===
===Daylight lamps===
[[File:Daylight lamp.jpg|thumb|Daylight lamp example (10000 lux). [https://www.amazon.com/Therapy-UV-Free-Brightness-Adjustable-Standing/dp/B07SJYVRD4 Amazon link (not sponsored)]]]
Though necessary in appropriate amounts, it is also possible to have too much dark period. This may occur when the local day length is too short (winter), or when the dark period extends too much into the daylight hours on [[#late core|late core]] schedules.
To avoid circadian instability due to excessive darkness, daylight lamps can be used to artificially simulate daylight, lengthening photoperiod. Daylight lamps are very bright white lamps often used as a treatment for [[Wikipedia:seasonal affective disorder|seasonal affective disorder]].
===Melatonin supplements===
===Melatonin supplements===
