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Melatonin Overload: Sleep Aid Backfires
23 Nov, 2025
Summary
- Excessive or poorly timed melatonin can disrupt natural sleep rhythms.
- High doses may cause vivid dreams and fragmented sleep patterns.
- Low doses, around 1 mg, are recommended for optimal sleep benefits.
Dr. Kunal Sood, an anesthesiologist, cautions against the overuse of melatonin, emphasizing its role as a timing signal rather than a sedative. He advises that incorrect dosage or timing can disrupt the body's natural circadian rhythm. Taking excessive or late doses can prolong melatonin's effects into the morning, causing a 'sleep hangover' and reduced alertness.
High doses of melatonin may also lead to more vivid dreams and disrupt sleep patterns by fragmenting sleep cycles. This fragmentation can worsen morning fatigue. Dr. Sood highlights that doses above one mg are metabolized slower and can interfere with the sleep-wake cycle, with reviews suggesting low doses enhance efficacy.
Many over-the-counter melatonin supplements may contain higher doses than indicated, increasing the risk of side effects. Sleep experts recommend starting with 0.5 to 1 mg. Lower doses support sleep onset without impacting morning alertness, while higher doses are less effective and more prone to causing grogginess and disrupting the body's internal clock.
