Hypersomnia is a sleep condition that causes excessive sleepiness. Somnolence is a symptom of hypersomnia and other medical conditions characterized by sleepiness. The terms hypersomnia and somnolence ...
Hypersomnia and narcolepsy are both sleep disorders that cause excessive daytime sleepiness and other changes in natural sleep-wake cycles. "Hypersomnia" actually refers to several sleep conditions ...