A person's circadian rhythm is an internal biological clock that regulates a variety of biological processes according to an approximate 24-hour period. A disorder of the circadian rhythm may cause sleeplessness on at transient or chronic basis. The disorder can be caused by air travel across time zones, shift work, irregular sleep-wake cycle, delayed sleep phase syndrome, and advanced sleep-phase syndrome.
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Insomnia is a common problem for many people. Insomnia can be primary or secondary. Secondary causes of insomnia include medications, diseases, environmental factors, and pregnancy. Non-drug, home remedies, and OTC and prescription drugs that treat insomnia include:
Common side effects of sleeping pills include: