Consider "Sleep Apnea".

This is a condition where one never quite falls asleep. In fact, the body can wake several thousand times a night. Ask some one who might have been in a position to observe you about your sleep patter. One sign is snoring. Another is gasping occasionally for breath. Yet another is stopping breathing for short to even long periods of time. There are even more indicators.

There is a higher incidence of Sleep Apnea amongst the mentally ill than in the regular population.

See your family doctor. They can pre-screen you and refer you to a sleep clinic. The sleep clinic sends you home with a test kit (basically a small computer you strap to your chest), gathers and looks at the results, and makes a diagnosis based on your type of sleep. There are ways to alleviate some sleep issues like the use of something called a cpap machine - I get mine next week.