A signal linked to darkness
Endogenous melatonin participates in circadian timing. Light exposure and timing belong in the interpretation of sleep outcomes. Source
Read the substance articleMECHANISMDefinition: sourced draft
Circadian signaling
Signals associated with the timing of sleep and waking.
Mechanistic context
Connections & claims
Open graphEach relationship keeps its participants and their roles together. Source details explain what the connection supports.
Endogenous melatonin participates in circadian timing.
Physiology summarized by NIH.
- Melatoninsignal
- Circadian signalingmechanism
- Hormonefunctional-class
Limitation Supplement effects depend on timing, condition and formulation.
Melatonin · Sourced draftCircadian timing and sleep
Fast-release melatonin with behavioral scheduling was studied in selected delayed sleep–wake phase disorder patients. The co-intervention is part of this relationship.
- Hormonefunctional-class
- Circadian signalingmechanism
- Sleepmeasured-outcome
- Behavioral sleep–wake schedulingco-intervention
- Melatoninexposure
Linked substances
1 entriesTagged articles and participants in the relationships above. A shared tag alone does not establish a causal effect.
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Definition sources
Supporting reading for this original editorial definition. Independent editorial review has not been recorded.
Observation & claim sources
- Public health reference · 2026
Melatonin: What You Need To Know
Explains circadian signaling, differences between sleep conditions and supplement quality concerns.
Limitation Public information, not individual clinical advice; year indicates access.
Funding / disclosures Not assessed; consult the original disclosure.
Source in Melatonin