light exposure duration shapes the nightly melatonin signal by 4+ hours
The duration of the nocturnal melatonin signal is compressed by more than 4 hours on long summer days (LD 16:8) compared with short winter days (LD 8:16), encoding photoperiodic information for seasonal physiological regulation.
What this means for you
Your body uses the length of your nightly melatonin window to 'read' the season and calibrate sleep, mood, and hormonal rhythms accordingly. When light exposure is timed well, this internal signal stays accurate — supporting deeper sleep cycles, more stable energy, and better hormonal balance across the year.
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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