Podbit · The Peter Attia Drive

#394 ‒ Sleep pharmacology: the role of medications in healthy sleep, the promise of emerging therapies, and the evidence for common sleep supplements

Explore episode Jun 1, 2026

Health & Fitness

Sleep Supplements: What Actually Has Evidence

#394 ‒ Sleep pharmacology: the role of medications in healt… · Jun 1, 2026 Health & Fitness

Most sleep supplements have weak or conflicting evidence. Glycine shows modest benefit with an excellent safety profile. Magnesium is mechanistically plausible but underwhelming in trials. Ashwagandha shows a small but real signal at ≥600 mg/day for ≥8 weeks, but quality control is abysmal — only 5 of 13 tested brands were accurate. Phosphatidylserine has mixed evidence but Peter Attia uses it personally for jet lag.

Where this was said

First-generation antihistamines for sleep: short-term sedation, anticholinergic risks, and concerns about long-term cognitive health

At 45:40 · chapter starts 44:00

First-generation antihistamines occupy a strange position in sleep medicine: they are the most accessible and cheapest sleep aids available, but Attia argues they are among the most problematic for anything beyond a day or two of use. Like trazodone, they block histamine H1 receptors, reducing histamine-driven arousal and causing drowsiness — hence their inclusion in PM pain relievers and cold remedies. But tolerance develops fast, often within days to weeks, making them functionally useless for chronic sleep problems. More concerning are their anticholinergic properties: inhibiting acetylcholine signaling causes dry mouth, constipation, urinary retention, blurred vision, cognitive slowing, and potential worsening of narrow-angle glaucoma. Observational data suggest that anticholinergic burden from chronic use may increase dementia risk — a finding Attia says deserves its own dedicated episode. The irony he finds particularly sharp: the cheapest sleep aids carry exactly the long-term neurological risks that the newer, expensive DORAs may help prevent.

Health & Fitness

OTC antihistamines: tolerance in days–weeks

#394 ‒ Sleep pharmacology: the role of medications in healt… · Jun 1, 2026

First-generation antihistamines like Benadryl develop tolerance very quickly — often within days to weeks — eroding their sleep benefit, while carrying anticholinergic dementia risk.

There's a real irony here. The cheapest, most accessible sleep aids carry exactly the kind of long-term neurological risks that the modern Doras may help prevent.

Peter Attia

#394 ‒ Sleep pharmacology: the role of …

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