<unk>  is used to diagnose, or rule out, many types of sleep disorders, including narcolepsy, idiopathic hypersomnia, periodic limb movement disorder (PLMD), REM behavior disorder, parasomnias, and sleep apnea. Although it is not directly useful in diagnosing circadian rhythm sleep disorders, it may be used to rule out other sleep disorders. The use of<unk>  as a screening test for persons having excessive daytime sleepiness as a sole presenting complaint is controversial.
Polysomnography
Somnology
Sleep study
Magnetoencephalography
Hypnogram
Electroencephalography
Audiometry
Echoencephalography