Does Benadryl Help with Insomnia?

The American Academy of Sleep Medicine and the American Academy of Family Physicians advise against the use of diphenhydramine (Benedryl) for sleep. Diphenhydramine, an antihistamine which has sedating effects, blocks histamine receptors in the brain that regulate wakefulness, typically causing drowsiness within 30-60 minutes. However, studies show tolerance develops quickly, often within 3-4 days of regular use. It is not effective for chronic sleep problems. Common side effects include next-day grogginess, dry mouth, and cognitive impairment. It increases risk for falls, especially in older adults. Agitation may occur in some people, especially children. Dependency can develop and withdrawal may worsen insomnia.