Insomnia is a sleep disorder characterized by difficulty initiating or maintaining sleep, or non restorative sleep, for at least
1 month
Psychological causes: stress
Physiological causes: schedule changes - drug abuse
Non-drug treatment for insomnia: behavioral
Drug treatment: benzodiazepines (ben-zo-die-AS-ah-peens)
Sleep apnea syndrome is characterized by sleep-disordered breathing with daytime sleepiness. It affects about 4 percent of men and 2 percent of women in their middle age. The prevalence of this condition increases with age and become a major cause of reported sleep disturbance and of people feeling excessively tired/sleepy during the day.
Narcolepsy is a disorder of sleep and wakefulness; all patients with narcolepsy are positive for the DR2 antigen which is one of the HLA antigens. Patients affected with narcolepsy have a chronic and excessive need to sleep regardless of the time of the day and this need is not relieved by increased sleep at night.