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Sleep deprivation increases this propensity, which can be measured by polysomnography (PSG) as a reduction in sleep latency (the time needed to fall asleep). [69] An indicator of sleep propensity can also be seen in the shortening of the transition from light stages of non-REM sleep to deeper slow-wave oscillations.
Word problem from the Līlāvatī (12th century), with its English translation and solution. In science education, a word problem is a mathematical exercise (such as in a textbook, worksheet, or exam) where significant background information on the problem is presented in ordinary language rather than in mathematical notation.
When a person struggles to fall asleep or stay asleep with no obvious cause , it is referred to as insomnia, [2] which is the most common sleep disorder. [3] Others include sleep apnea , narcolepsy and hypersomnia (excessive sleepiness at inappropriate times), sleeping sickness (disruption of sleep cycle due to infection), sleepwalking , and ...
It has distinct meanings and causes. It can refer to the usual state preceding falling asleep, [1] the condition of being in a drowsy state due to circadian rhythm disorders, or a symptom of other health problems. It can be accompanied by lethargy, weakness and lack of mental agility. [2]
[36] [37] Individuals with less than 6 hours of sleep are the most likely to fall asleep at the wheel and with the average university students getting that amount of sleep, the dangers are a real factor for students. [38] [39] Once a student makes it to class, sleep deprivation will affect their ability to stay awake throughout the class. [38 ...
The quality of sleep may be evaluated from an objective and a subjective point of view. Objective sleep quality refers to how difficult it is for a person to fall asleep and remain in a sleeping state, and how many times they wake up during a single night. Poor sleep quality disrupts the cycle of transition between the different stages of sleep ...
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[1] [11] They may have difficulty falling asleep, or staying asleep for as long as desired. [1] [9] [12] Insomnia is typically followed by daytime sleepiness, low energy, irritability, and a depressed mood. [1] It may result in an increased risk of accidents of all kinds as well as problems focusing and learning. [9]