Observe these caveats if you use over-the-counter drugs or dietary supplements to help you sleep, reports Harvard Health Publishing.

“You tend to become tolerant of the effect relatively quickly, so they stop working for you. And we don’t have a lot of long-term data about what happens if you use them for long periods of time,” Dr. Epstein says. “And there is the potential that antihistamines may cause side effects in older adults, such as confusion and falls.”