Sleep deprivation is the condition of not having enough sleep. The condition affects the brain and its cognitive function. The condition can be either chronic or acute. Paradoxically, sleep deprivation can be used to treat certain disorders, such as clinical depression. Sleep deprivation has also been used as a form of torture. Multiple factors can cause or contribute to sleep deprivation including poor sleep hygiene, lifestyle choices, work obligations, sleep disorders, and other medical conditions. Sleep deficiency may be caused by other sleep disorders or medical conditions. For example, sleep apnea, a breathing disorder that induces dozens of nightly awakenings, may hinder both sleep duration and quality. Other medical or mental health problems, such as pain or general anxiety disorder, can interfere with the quality and quantity of sleep.

Main health effects of sleep deprivation.

Minor dark circles, in addition to a hint of eye bags, a combination suggestive of minor sleep deprivation.