hypersomnia

As nouns the difference between drowsiness and hypersomnia

is that drowsiness is state of being drowsy while hypersomnia is (medicine|pathology) excessive sleepiness.

As nouns the difference between narcolepsy and hypersomnia

is that narcolepsy is (pathology) a disorder characterized by sudden and uncontrollable attacks of deep sleep, often brief, sometimes accompanied by paralysis and hallucinations while hypersomnia is (medicine|pathology) excessive sleepiness.

As nouns the difference between somnophilia and hypersomnia

is that somnophilia is a paraphilia in which an individual becomes sexually aroused by someone who is unconscious while hypersomnia is (medicine|pathology) excessive sleepiness.

As nouns the difference between hypersomnolence and hypersomnia

is that hypersomnolence is excessive sleepiness while hypersomnia is excessive sleepiness.

As a noun hypersomnia is

(medicine|pathology) excessive sleepiness.

As a noun hypersomnia

is (medicine|pathology) excessive sleepiness.

As an adjective hypersomniac is

of or relating to hypersomnia—excessive sleepiness.

Hypersomnia is a related term of insomnia.

As nouns the difference between insomnia and hypersomnia

is that insomnia is a sleeping disorder that is known for its symptoms of unrest and the inability to sleep while hypersomnia is excessive sleepiness.

As nouns the difference between sleepiness and hypersomnia

is that sleepiness is the property of being sleepy while hypersomnia is (medicine|pathology) excessive sleepiness.