Usually, this problem can be avoided by limiting your nap time. If someone is sleep deprived, their sleep inertia tends to last longer. The Centers for Disease Control and Prevention (CDC) describes it as "a temporary disorientation and decline in performance and/or mood after awakening from sleep." This state of disorientation doesn't typically last more than 30 minutes, but some research has shown lingering sleep inertia for up to two hours after waking, the CDC states. Sleep inertia is a common cause of postnap sickness. Ahead, find more on sleep inertia, how to avoid it, and other reasons you might feel sick after you wake up from a nap. Sleep inertia is known to make people feel groggy, disoriented, drowsy, and cognitively impaired. "If you wake from a nap and were in stage N3 when you awaken, then you are likely to experience 'sleep inertia,' or a feeling of being half asleep after waking." Postnap exhaustion or sickness "can occur when the person naps long enough to get into deep sleep, what we call stage N3 sleep," Benjamin Nager, MD, a neurologist at Northwestern Medicine Huntley Hospital, tells POPSUGAR. Most commonly, this sort of fatigue stems from sleeping too long, which can lead to sleep inertia. But if you're someone who wakes up from naps feeling more exhausted - or even sick to your stomach - the quick snoozes don't always feel beneficial or even enjoyable. Lying down in the middle of the day can help you feel refreshed and ready to tackle your afternoon.
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