• Intrinsic sleep disorders
  Includes Psychophysiological Insomnia, Sleep state misperception, Idiopathic insomnia, Narcolepsy, Recurrent hypersomnia, Idiopathic hypersomnia, Posttraumatic hypersomnia, Obstructive sleep apnea syndrome, Central sleep apnea syndrome, Central alveolar hypoventilation syndrome, Periodic limb movement disorder, and Restless legs syndrome.
  12 disorders in this group.
• Extrinsic sleep disorders
  Includes Inadequate sleep hygiene, Environmental sleep disorder, Altitude insomnia, Adjustment sleep disorder, Insufficient sleep syndrome, Limit-setting sleep disorder, Sleep-onset association disorder, Food allergy insomnia, Nocturnal eating (drinking) syndrome, Hypnotic-dependent sleep disorder, Stimulant-dependent sleep disorder, Alcohol-dependent sleep disorder, and Toxin-induced sleep disorder.
  13 disorders in this group.
• Circadian rhythm disorders
  Includes Time zone change syndrome, also known as "jetlag", Shift-work sleep disorder, Irregular sleep-wake pattern, Delayed sleep-phase syndrome, Advanced sleep-phase syndrome, and 24-hour sleep-wake syndrome.
  6 disorders in this group.

These are not primarily disorders of sleeping or waking, these are disorders of partial arousal or interfernce with sleep stage transitions.

• Arousal disorders
  Includes Confusional arousals, Sleepwalking, and Night terrors.
  3 disorders in this group.
• Sleep-wake transition disorders
  Includes Rhythmic movement disorder, Sleep starts, Sleep talking, and Nocturnal leg cramps.
  4 disorders in this group.
• Parasomnias usually associated with REM sleep
  Includes Nightmares, Sleep Paralysis, Impared sleep-related penile erections, Sleep-related painful erections, REM sleep-related sinus arrest, and REM sleep behaviour disorder.
  6 disorders in this group.
• Other parasomnias
  includes Sleep Bruxism (grinding or clenching teeth during sleep), Sleep Enuresis (bedwetting), Sleep-related abnormal swallowing syndrome, Sudden unexplained nocturnal death syndrome, Primary snoring, Infant sleep apnea, Congenital central hypoventilation syndrome, Suddent infant death syndrome, and Benign neonatal sleep myoclonus.
  9 disorders in this group.

• Sleep disorders associated with medical disorders
  Includes Alcoholism, Sleeping sickness, Nocturnal cardiac ischemia, Chronic obstructive pulmonary disease, Asthma, Sleep-related gastroesophageal reflux, Peptic ulcer, and Fibrositis syndrome.
  8 disorders in this group.
• Sleep problems associated with neurological disorders
  Includes Degenerative brain disorders, Sleep-related epilepsy, and Sleep-related headaches.
  3 disorders in this group.
• Sleep disorders associated with psychiatric disorders
  Includes Psychoses, Mood disorders, Anxiety disorders, Panic disorders,
  4 disorders in this group.

There is not enough information known about these disorders to firmly establish them as separate disorders.

• Short sleeper
• Long sleeper
• Subwakefulness syndrome
• Fragmentary myoclonus
• Sleep hyperhydrosis (night sweats)
• Menstrual-associated sleep disorder
• Pregnancy-associated sleep disorder
• Terrifying hypnagogic hallucinations
• Sleep-related laryngospasm
• Sleep choking syndrome