Opinion: Humans need healthy light exposure for good sleep. Daylight saving time interrupts that. [Opinion]
After a few days, additional evening light delays the release of the hormone melatonin, and shifts circadian rhythms to adjust to the new schedule. The immediate impact of these effects may be brief, subsiding after a few days. But living on daylight saving time for months has longer-lasting negative effects on circadian rhythms and sleep, which are more detrimental and the real problem with daylight saving time.
This would greatly reduce exposure to morning sunlight — the most powerful environmental signal to set circadian rhythms in the brain. Low levels of outdoor light exposure have been linked byto depression, anxiety and insomnia. Chronobiologists predict permanent daylight saving time would have adverse effects on health and productivity, and point out it would undo any benefits of recent reforms around delaying school start times.
Daylight saving time makes the already long summer days go an hour later and causes people to postpone essential sleep. Since summer sunrise times are earlier, the net effect is that sleep is pinched at both ends and people generally sleep much less during daylight saving time.While lawmakers focus on the inconvenience around clock changes, lack of light and long-term sleep loss are bigger concerns from a health and science standpoint. Permanent daylight saving time seemswith the public.
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