Sleeplessness and sleep deprivation

Insomnia, also known as sleeplessness, is a sleep disorder causing difficulty falling asleep or staying asleep for as long as desired. Insomnia is typically followed by daytime sleepiness, low energy, irritability, and a depressed mood. It may result in an increased risk of accidents as well as problems focusing and learning. Insomnia can be short-term, lasting for days or weeks, or long-term, lasting more than a month. The concept of the word insomnia has two distinct possibilities: insomnia disorder or insomnia symptoms.

condition of not having enough sleep

Prion disease of the human brain

condition in which a person will engage in sexual activities while asleep

a person who tends to stay up until late at night

thumb|Example of an EEG alpha wave thumb|Example of an EEG theta wave

Internet urban legend

American sleeplessness world record holder

psychological phenomenon

cumulative effect of not getting enough sleep

effects of blue light

increased frequency of REM after sleep deprivation