A<unk>  (somnipathy) is a<unk>  in the sleep patterns of a person or animal.  Some<unk> s can interfere with mental and emotional function.  A test commonly ordered for some<unk> s is the polysomnogram.
Sleep disorder
Insomnia
Parasomnia
Sleep Apnea
Anxiety
Sleep hyperhidrosis
Sleep debt
Shift work sleep disorder