Melatonin and sleep: Exploring its role in regulating the circadian rhythm and sleep-wake cycle.
Level 5 - mechanism / opinion, no new human data
Narrative review of physiology, mechanisms, and clinical applications without systematic review methodology or new human data.
PubMed 42257163 · doi:10.4103/jfmpc.jfmpc_150_25
What was done
This narrative review synthesized the biochemical pathways of melatonin synthesis from serotonin via AANAT and HIOMT enzymes, its suprachiasmatic nucleus-mediated circadian regulation, receptor actions (MT1 and MT2), and clinical applications for circadian rhythm sleep-wake disorders, jet lag, and insomnia.
What was found
The abstract reports no numerical data, effect sizes, or quantitative findings. It notes that melatonin facilitates sleep onset, circadian alignment, and sleep maintenance, while highlighting that optimal dosing regimens and long-term safety profiles remain undetermined.
Why it matters
The review summarizes the mechanistic and physiological rationale for exogenous melatonin use in primary care sleep management and circadian realignment.
Limits
This is a narrative review presenting no original empirical data, quantitative meta-analysis, or systematic search methodology. Specific details regarding comparative efficacy, population subgroups, dosing, and long-term adverse effects are not provided in the abstract.
Cited by
- supports Melatonin is released from the pineal gland.