1.Dyssomnias- Dyssomnia is a disruption of the body's natural resting
and waking patterns.2.Parasomnias-Parasomnias are conditions that interrupt
sleep. They're caused by difficulties with arousal or sleep stage transitions.
Sleepwalking, nightmares, bedwetting and restless legs syndrome are all
common parasomnias.
3.Medical/psychiatric problems-Medical or psychological
conditions, such as alcoholism, ulcers, asthma and anxiety disorders,
can cause rest-related disturbances. In such cases, treating the underlying
problem should improve a person's rest pattern.
4.Proposed disorders-proposed disorders are rest-related disturbances
that are under investigation. They may or may not prove to be actual disorders.