Melatonin Production
Natural evening melatonin rise varies up to 10-fold between people. Low producers struggle with sleep onset, no matter how good their sleep hygiene is. High producers naturally fall asleep early—sometimes inconveniently so. Light exposure and supplement timing finally make sense once you know your baseline.
What this measures
How your DNA shapes melatonin production.
AANAT codes for the enzyme that converts serotonin into N-acetylserotonin, and ASMT codes for the enzyme that converts N-acetylserotonin into melatonin. The two-step pathway runs in the pineal gland at night and is sharply suppressed by even moderate light exposure.
Carriers of common AANAT and ASMT reduced-activity variants are associated with lower nighttime melatonin production — and may experience longer sleep onset, lighter sleep, or seasonal mood changes related to winter light scarcity. Carriers of higher-function variants tend to produce robust melatonin rhythms on default light exposure.
Serotonin is the upstream substrate, which is why tryptophan-rich evening meals and adequate B6 status both support endogenous melatonin synthesis. Bright morning light increases nighttime melatonin output (the body anchors the dark-period production to the strength of the prior light period). Even brief evening light exposure (60–90 minutes of bright indoor lighting) suppresses melatonin synthesis by 50–90%.
Standard sleep advice focuses on melatonin supplementation; the upstream lever — protecting the body’s own production — moves the needle for more clients. Which AANAT/ASMT variant pattern you carry decides whether the focus belongs on supplementing or on protecting endogenous synthesis through morning light and evening dim.
Melatonin Production is one specific finding in this system. Your Genomic Lifestyle Optimization Report shows where your variants place you on the sleep optimization and circadian health spectrum — and what you can do about it: it renders as a dark card with a color marker calibrated to your variants, opening with the gene mechanism and closing with a practical, mechanism-led recommendation.
Want to see what a real Mosaic dark card looks like? Walk through a sample report →
In context
Melatonin Production & Response: the 3-insight cluster.
Melatonin Production is one finding in a tightly-related cluster. Mosaic sequences the other 2 alongside it so you see the whole biology — not an isolated data point.
Questions people ask
About Melatonin Production.
More from Sleep Optimization and Circadian Health
Circadian Propensity
Classic morning lark, night owl, or somewhere in between—your chronotype is mostly genetic. Scheduling life around it instead of against it is the easiest health upgrade you'll ever make. Fighting it is the most exhausting.
Read insight →Ideal Sleep Duration
Restorative needs range from ~6.5 to ~9 hours between different people. Consistently short-changing your personal number—even by 30 minutes—is often the silent cause of "I sleep 8 hours, but I'm still tired." Maybe you need 8.5. Maybe you only need 7.
Read insight →Melatonin Metabolism
How quickly your body clears melatonin determines whether you wake up groggy from a 1 mg supplement, or can take 5 mg and feel nothing the next morning. Slow metabolizers need lower doses and earlier timing. Fast metabolizers can afford more flexibility.
Read insight →Melatonin Supplement Response
Receptor sensitivity predicts whether melatonin helps you fall asleep faster—or just gives you weird dreams and a morning hangover. If supplements have never worked for you, this might explain why. If they work too well, same answer.
Read insight →Propensity for Daytime Drowsiness
Arousal regulation differs between people. Some stay sharp and alert on 6 hours of sleep; others feel drowsy even after 9. Knowing yours separates "I'm sleeping poorly" from "my daytime alertness drive is genetically lower"—two different problems with different solutions.
Read insight →Risk of Sleep Disruption
Sensitivity to noise, light, and temperature during sleep varies genetically. High-vulnerability individuals need blackout curtains, white-noise machines, and temperature control; low-vulnerability people sleep through fireworks and wonder what all the fuss is about.
Read insight →
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