Insomnia

Almost everyone occasionally suffers from short-term insomnia. This problem can result from stress, jet lag, diet, or many other factors. Insomnia almost always affects job performance and well-being the next day. About 60 million Americans a year have insomnia frequently or for extended periods of time, which leads to even more serious sleep deficits. Insomnia tends to increase with age and affects about 40 percent of women and 30 percent of men. It is often the major disabling symptom of an underlying medical disorder.

The amount of sleep each person needs depends on many factors, including age. Infants generally require about 16 hours a day, while teenagers need about 9 hours on average. For most adults, 7 to 8 hours a night appears to be the best amount of sleep, although some people may need as few as 5 hours or as many as 10 hours of sleep each day. Women in the first 3 months of pregnancy often need several more hours of sleep than usual. The amount of sleep a person needs also increases if he or she has been deprived of sleep in previous days. Getting too little sleep creates a "sleep debt," which is much like being overdrawn at a bank. Eventually, your body will demand that the debt be repaid. We don't seem to adapt to getting less sleep than we need; while we may get used to a sleep-depriving schedule, our judgment, reaction time, and other functions are still impaired.

Is nodding off during daytime hours ever normal? What if you are watching a particularly dreary movie, or listening to an extremely boring lecture? The answer may surprise many people. It is never normal. It may be normal to feel less energized, particularly if in the late afternoon when most of our circadian rhythms lag a little. However, one of the main clues that someone is not sleeping adequately at night, is daytime drowsiness.

According to the Mayo Clinic, here are signs and symptoms of insomnia:

• Inability to get enough sleep at night
• Difficulty falling asleep at night
• Waking up during the night