Circadian-based new technologies for night workers.

Bright light treatments may help night workers align their circadian rhythms.

• Night work is increasingly common but is not aligned with human physiology.
• Circadian and homeostatic processes that control alertness are disrupted in night workers.
• Laboratory studies suggest bright light treatments can improve circadian alignment.
• The effectiveness of exercise and melatonin for this issue is uncertain.
• There are a growing number of potential solutions for shift workers.

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