There are about 19 different types of sleep disorders. Four of the most common types are Insomnia, Sleep Apnea, Narcolepsy and Restless Leg Syndrom. You should always consult your doctor if you feel you have a sleeping disorder.
Studies have estimated that as many as one-third of Americans have suffered from sleep disorders, which may be psychological in origin and related to anxiety, stress and lifestyle.
It depends on what kind of disorders you're talking about. There are mental disorders, muscle disorders, organ disorders, etc. But disorders in general, probably hundreds.
I have this situation it started when i was a little girl where id would be scared to go to sleep i would think someone was going to kill me but when i sleep with someone else in bed with me i don't...
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