Mindblown: a blog about philosophy.

The subjective sense that one has disordered sleep without objective findings of insomnia, hypersomnia, narcolepsy, sleep apnea, or other sleep disorders.  

Muscle jerking or shortening that occurs at the onset of sleep, usually involving the legs but occasionally the arms, neck, or head.  

An autosomal dominant condition in which the person sleeps well and for a normal amount of time but not at the usual bedtime hours. Those with delayed sleep-phase syndrome may function best if they go to sleep about the time most people are awakening. Those with advanced sleep phase syndrome do best when they go…

Staying asleep after initially falling asleep. Patients with sleep maintenance insomnia fall asleep easily but then awaken in the middle of the night and have difficulty resting or sleeping after that.  

Operating a motor vehicle without being fully awake and alert, especially when consciousness is affected by sedative or hypnotic drugs.  

The organization of brain wave activity characteristic of each of the stages of sleep.