light exposure rapidly lowers pineal melatonin levels within 20 minutes
Exposure of rats to a sudden light at night causes the pineal melatonin content to decline rapidly with a half-time of approximately 5 minutes, reaching its lowest level within 20 minutes.
What this means for you
Melatonin is your body's primary sleep-onset signal. Understanding how quickly light suppresses it helps explain why timed light exposure can be used to shift alertness and support your natural sleep-wake rhythm — useful for anyone managing jet lag, shift schedules, or morning grogginess.
The published research
From the Pineal Gland to the Central Clock in the Brain: Beginning of Studies of the Mammalian Biological Rhythms in the Institute of Physiology of the Czech Academy of Sciences
Physiological Research · 2024
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