By Ann Reyes, Ph.D. Insomnia includes difficulty falling asleep or staying asleep, and early morning awakening. Insomnia can be a symptom of another disorder. It may vary from restlessness or disturbed sleep to a shortened length of sleep.
Some individuals suffer complete wakefulness.
Primary insomnia is diagnosed if sleep should normally occur, and two possible influences are ruled out. The first influence is something external, like noise or bright light that hinders sleep. The second influence is any disorder, medication, or other substance that might be causing the sleep problem. Sleeplessness is considered to be a problem when it is severe enough to prevent the brain from getting enough rest on a consistent basis. An occasional sleepless night is not usually considered a problem.