What are the risks of taking Benadryl to sleep?
Last updated September 3, 2026.
It sedates rather than restores sleep - and the risks stack: tolerance within days, next-day grogginess and impaired driving, the anticholinergic burden (dry mouth, constipation, urinary retention, confusion and falls in older adults), and a research signal linking regular anticholinergic use to higher dementia risk. Geriatric guidance puts diphenhydramine on the avoid list for people over 65, and MedlinePlus warns against using it to make a child sleepy. The better toolkit: sleep hygiene, CBT-I, and a doctor conversation if you need nightly help - safer options exist.
What to do
- Reserve it for rare use. An occasional rough night, not a nightly habit.
- Never mix with alcohol or other sedatives. The combination is where overdoses happen.
- Keep it from older adults and kids. Both groups carry specific warnings.
- Switch to the durable fix. CBT-I treats the insomnia instead of sedating it.
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