Insomnia

Almost everyone has occasional sleepless nights, perhaps due to stress, heartburn, or drinking too much caffeine or alcohol. Insomnia is a lack of sleep that occurs on a regular or frequent basis, often for no apparent reason.

How much sleep is enough varies from person to person. Although 7 1/2 hours of sleep is about average, some people do well on four to five hours of sleep. Other people need nine to 10 hours of sleep each night.

Insomnia can affect not only your energy level and mood, but your health as well because sleep helps bolster your immune system. Fatigue, at any age, leads to diminished mental alertness and concentration. Lack of sleep caused by insomnia is linked to accidents both on the road and on the job.

Insomnia may be temporary or chronic. You don't necessarily have to live with the sleepless nights of insomnia. Some simple changes in your daily routine and habits may result in better sleep.