Which of the following sleep disorders is characterized by excessive quantities of sleep?

A) Primary insomnia
B) Central sleep apnea
C) Nightmare disorder
D) Hypersomnia

Hypersomnia

A sleep disorder characterized by excessive sleepiness, where the individual has trouble staying awake during the day, even after long periods of sleep.

Sleep Disorders

Disturbances in sleeping or staying awake, such as insomnia and narcolepsy.

Excessive Sleep

A condition characterized by sleeping for extended hours, typically more than what is considered necessary for normal functioning, which can indicate underlying health issues.