Delta waves are more likely to be increased after periods of sleep deprivation or loss. Delta waves, or slow waves, are most commonly seen in the non-rapid eye movement stage of sleep. Increase in Delta Waves: Some research suggests that sleep inertia is caused by an increase in delta waves in the posterior part of the brain. The cause of sleep inertia is unknown, but there are three common theories explaining sleep inertia. The most common symptoms of sleep inertia are: Sleep inertia symptoms can be present upon waking from a lengthy sleep period or naps over 30 minutes. The symptoms of sleep inertia are the most noticeable upon waking and slowly decrease over time. As a result, these workers might experience slowed reaction times and decreased cognitive alertness at work that increase the chance of work-related injuries. Medical interns and residents who work rotating shifts or are on call regularly have a significant decrease in cognitive alertness and performance. Regardless of its biological basis, sleep inertia can impact the safety and wellness of people who work long, frequently changing hours or shift work. However, researchers hypothesize that sleep inertia is a protective mechanism that helps maintain sleep during moments of unwanted wakings. ![]() The biological reason for sleep inertia is unknown. Sleep inertia generally lasts for 15 to 60 minutes but may last for up to a few hours after waking. Sleep inertia is the feeling of grogginess, disorientation, drowsiness, and cognitive impairment that immediately follows waking. Managing sleep inertia can also help ensure safety at work and home. Learning about sleep inertia’s causes, symptoms, and diagnostic process can be beneficial. Sleep inertia can negatively impact reaction times related to important tasks like driving and decision-making. It is more common in people with alternative sleep schedules, like shift workers and military personnel. ![]() Yet, some people may feel groggy and disoriented, even after receiving adequate sleep. Without adequate sleep, we wouldn’t have healthy physical and mental development. Sleep is imperative to our health and wellness.
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