Sleep aids: Could antihistamines help me sleep?

Antihistamines can cause drowsiness, which may help you fall asleep for a few nights — but routine use of antihistamines for insomnia isn't recommended.

Antihistamines induce drowsiness by working against histamine, a chemical produced by the central nervous system. In fact, most over-the-counter sleep aids contain antihistamines. These products are intended to be used for only two to three nights at a time, however, such as when stress, travel or other disruptions keep you awake. Tolerance to the sedative effects of antihistamines can develop quickly — so the longer you take them, the less likely they are to make you sleepy. Side effects may include daytime drowsiness, dry mouth, dizziness and memory problems.

If you're struggling with chronic insomnia, don't rely on antihistamines or other over-the-counter sleep aids for a good night's sleep. Lifestyle changes — rather than sleep aids — are usually the best approach. Start with the basics, such as:

• Following a regular sleep schedule
• Avoiding caffeine and daytime naps
• Including physical activity in your daily routine
• Managing stress

If you continue to have trouble falling or staying asleep, consult your doctor. In addition to lifestyle changes, your doctor may recommend behavior therapy to help you learn new sleep habits and ways to make your sleeping environment more conducive to sleep. In some cases, short-term use of prescription sleep aids may be recommended as well.