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Waking up tired: Causes and solutions | CNN

Sleeping seven to eight hours a night and still feeling tired is due to a heightened state of sleep inertia, a circadian process that modulates memory, mood, reaction time and alertness upon waking, according to a 2015 study. Some people experience impaired performance and grogginess in this period after first turning off the alarm. The effects of sleep inertia usually go away after 15 to 60 minutes but can last for up to a few hours. Christopher Barnes, professor of management at the UW, is quoted.