What causes lack of deep sleep?

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Sleep deprivation occurs when an individual gets less sleep than they need to feel awake and alert. People vary in how little sleep is needed to be considered sleep-deprived. Some people such as older adults seem to be more resistant to the effects of sleep deprivation, while others, especially children and young adults, are more vulnerable. Although occasional sleep interruptions are generally no more than a nuisance, ongoing lack of sleep can lead to excessive daytime sleepiness, emotional difficulties, poor job performance, obesity and a lowered perception of quality of life. There is no questioning the importance of restorative sleep, and a certain amount of attention is necessary to both manage and prevent sleep deprivation.

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