People with sleep inertia have higher levels of delta waves, which are linked to deep sleep. Increased levels of delta waves in the brain. They may feel groggy and disoriented if interrupted during a deep sleep period. People go through multiple sleep cycles at night. If the level of adenosine is too high in the morning, it encourages sleep. Adenosine is a chemical in the brain that rises and falls during the day to help people feel sleepy and wake up. Scientists aren’t sure exactly what causes that tired feeling from sleep inertia. There are multiple theories on the causes of sleep inertia Likewise, sleep inertia can make the symptoms of other sleep disorders worse. While sleep inertia isn’t a sleep disorder, sleep apnea and other conditions can make sleep inertia symptoms more severe. ![]() Some people have a more severe form of sleep inertia, called “sleep drunkenness.” With this type of sleep, inertia, confusion, slowness, and lack of coordination can last up to four hours. Once you do wake up, you may feel groggy for minutes to hours later.Īnyone can experience sleep inertia. In other words, waking up after a long nap or a full night of sleep is tough. Like general inertia, sleep inertia makes it hard to go from that state of rest. ![]() Inertia, or resistance to movement, is what scientist Isaac Newton established as his first law of motion: that a body at rest tends to remain at rest. Sleep inertia may cause that can’t-wake-up feeling. But why is it hard to wake up in the morning even after you’ve had your eight hours of deep slumber? Most people have difficulty waking up after they go to bed late or if they’ve had a night of interrupted sleep.
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