Sleep apnea, insomnia, and narcolepsy are the most common disorders diagnosed.
Sleep apnea is the periodic cessation of breathing during sleep.
This potentially life-threatening condition causes a decreased oxygen supply to body organs. The problem is usually recognized by loud, chronic snoring. The cessation of breathing may be sudden and prolonged, and sufferers may have from a few to several hundred apneic episodes in one night. Syptoms may include morning headaches, excessive daytime sleepiness, disorientation, poor memory, and declining social performance. Insomnia is the inability to sleep.