Condition

Symptoms

Insomnia

• Difficulty falling asleep
  
  
• Difficulty staying asleep
  
  
• Waking up feeling tired, even after a full night's sleep

Sleep apnea

• Breathing that stops during sleep
  
  
• Choking or gasping during sleep
  
  
• Loud snoring

Hypersomnia

• Recurrent episodes of daytime sleepiness or prolonged nighttime sleep
  
  
• Anxiety
  
  
• Decreased energy

Narcolepsy

• Sudden episodes of loss of muscle function (cataplexy)
  
  
• Sleep paralysis (temporary inability to talk or move when falling asleep or waking up)
  
  
• Hypnagogic hallucinations (vivid, often frightening dream-like experience)

Circadian rhythm sleep disorders

• Difficulty falling and staying asleep and/or late night insomnia
  
  
• Lack of energy in the morning
  
  
• Increase of energy/mood in the evening

Nightmares

• Abrupt awakening from sleep, usually later in the sleep period
  
  
• Memory of a frightening dream
  
  
• Little confusion or disorientation upon waking

Night terrors

• Abrupt awakening from sleep, usually earlier in the sleep period
  
  
• No memory of episode
  
  
• Confusion or disorientation upon waking