<unk>  is a medical condition involving an excess of morbid dreams and nightmares.<unk>  is suspected to have many causes, including fear, stress, depression, trauma, and sleep deprivation, among others. It may also be caused by the effects of antihistamines.
Paroniria
Periodic paralysis
Spinocerebellar ataxia
Argyria
Episodic ataxia
Dysthanasia
Paramyotonia congenita
Pleurothotonus