common causes of somnolence
The most common causes of excessive daytime sleepiness are sleep deprivation, obstructive sleep apnea, and sedating medications. Other potential causes of excessive daytime sleepiness include certain medical and psychiatric conditions and sleep disorders, such as narcolepsy.
Some very common causes of excessive daytime sleepiness include: 1  Behavioral sleep deprivation. This is the most prevalent cause of excessive daytime sleepiness, and almost everyone is a culprit of self-induced sleep deprivation at one time or another. 2  Narcolepsy.