Melatonin Supplement Guide — Dosage, Timing, Type Compatibility
In short: Melatonin works best for circadian misalignment (jetlag, shift work). For general insomnia, evidence is weak. 0.3-0.5 mg often works better than 5-10 mg (counterintuitive). Take 90 minutes before desired sleep time.
What melatonin actually does
Melatonin is the circadian signal hormone, not a sedative. Your pineal gland releases it about 2 hours before natural bedtime, signaling "begin sleep mode."
Supplements don't make you sleep faster — they shift your clock earlier (if taken in the evening) or later (if taken in the morning, rarely needed).
Dosing
| Use case | Dose | Timing | |---|---|---| | Jetlag | 0.5 mg | At destination bedtime | | Shift work | 0.3 mg | 90 min before sleep | | Delayed Sleep Phase | 0.5 mg | Same time each evening, 90 min pre-bed | | Mild insomnia | 0.3 mg trial | 90 min pre-bed |
Avoid 5-10 mg "max strength" tablets — they're often less effective than low dose, and can cause grogginess.
When it works (and doesn't)
Works for:
- Jetlag (especially eastward travel)
- Shift work disorder
- Delayed Sleep Phase Disorder (teens, young adults)
- Some elderly patients (natural melatonin declines with age)
Doesn't work for:
- General "can't sleep" complaints
- Anxiety-related insomnia
- Sleep maintenance insomnia (waking up at 3 AM)
- Most chronic insomnia (CBT-I is the better answer)
16-type considerations
- R types: Won't help with the thinking. Use magnesium + L-theanine instead.
- N types forced into M schedules: Best candidates for melatonin to shift earlier
- M types: Rarely need it
- Travel for any type: Useful for jetlag
Safety
- Generally safe short-term
- Long-term safety less studied — use as needed, not nightly
- Not regulated as a drug in US — quality varies, choose USP-verified
- Don't combine with sedating medications without doctor approval
- Children: Only under pediatric guidance — not for general use
FAQ
Q1. Does melatonin cause dependency?
No physical dependence, but psychological habituation possible. Stop and you'll sleep again normally.
Q2. Why doesn't my 10 mg work?
High doses can paradoxically cause grogginess and disrupt natural cycles. Try 0.3 mg.
Q3. Time-release vs immediate?
For sleep onset: immediate. For sleep maintenance (waking at 3 AM): time-release may help.
Q4. Can I take it every night?
Not recommended long-term. Use for specific circadian needs, not as a nightly habit.
Bottom line
Melatonin is a circadian signal, not a sedative. Use at low dose (0.3-0.5 mg), 90 min before desired sleep. Most useful for jetlag and shift work.
Related reading
⚠ Medical note: Consult a healthcare provider before adding melatonin, especially for children, during pregnancy, or with other medications. eSleep Clinic is not a medical institution.