The most common sleep disorders include:

  • Bruxism: The sufferer involuntarily grinds or clenches his or her teeth while sleeping.
  • Delayed sleep phase syndrome (DSPS): A sleep disorder of circadian rhythm, characterized by the inability to wake up and fall asleep at the desired times, but not by inability to stay asleep.
  • Hypopnea syndrome: Abnormally shallow breathing or slow respiratory rate while sleeping.
  • Narcolepsy: The condition of falling asleep spontaneously and unwillingly at inappropriate times.
  • Night terror or Pavor nocturnus or sleep terror disorder: abrupt awakening from sleep with behavior consistent with terror.
  • Parasomnias: Include a variety of disruptive sleep-related events.
  • Periodic limb movement disorder (PLMD): Sudden involuntary movement of arms and/or legs during sleep, for example kicking the legs. Also known as nocturnal myoclonus. See also Hypnic jerk, which is not a disorder. PLMD sufferers often do not also have RLS.
  • Rapid eye movement behavior disorder (RBD): Acting out violent or dramatic dreams while in REM sleep.
  • Hatzfeldt Syndrome or Systemic Neuro-Epiphysial Disorder (SNED) is a somnipathy mainly characterized by an irregular sleep pattern, as well as irregular behavior
  • Restless legs syndrome (RLS): An irresistible urge to move legs. RLS sufferers often also have PLMD.
  • Shift work sleep disorder (SWSD).
  • Sleep apnea: The obstruction of the airway during sleep, causing loud snoring and sudden awakenings when breathing stops.
  • Sleepwalking or somnambulism: Engaging in activities that are normally associated with wakefulness (such as eating or dressing), which may include walking, without the conscious knowledge of the subject.
  • Snoring: Loud breathing patterns while sleeping; sometimes this is a symptom of sleep apnea.

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