These findings have led researchers to believe that it’s possible for humans to experience brief episodes of local sleep in the brain while appearing awake. They inserted probes into neurons affecting their motor cortex while using an electroencephalogram (EEG) to record their brain’s electrical activity.Įven though EEG results indicated that the sleep-deprived rats were fully awake, the probes revealed areas of local sleep. In a 2011 study, researchers kept lab rats awake for an extended period of time. The exact cause of microsleep isn’t fully understood, but it’s believed to happen when parts of the brain fall asleep while other parts of the brain remain awake. Narcolepsy causes extreme daytime drowsiness and intermittent uncontrollable episodes of falling asleep.As a result, your brain doesn’t receive enough oxygen during sleep, which can trigger daytime sleepiness. With obstructive sleep apnea, a blockage in your upper airway interrupts breathing while sleeping.You may also experience microsleep if you have a sleep disorder: This can happen if you have insomnia, work a night shift, or don’t get enough quality sleep for other reasons. A lack of sleep is a risk factor for microsleep.
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