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Sleep inertia is a physiological state of impaired cognitive and sensory-motor performance that is present immediately after awakening. It persists during the transition of sleep to wakefulness, where an individual will experience feelings of drowsiness, disorientation and a decline in motor dexterity.
DSPD is a chronic condition. Symptoms must have been present for at least three months before a diagnosis of DSPD can be made. [36] Often people with DSPD manage only a few hours sleep per night during the working week, then compensate by sleeping until the afternoon on weekends.
Individuals with IH share common symptoms including excessive daytime sleepiness, sleep inertia, brain fog, and long sleep periods. [10] [11] [12]Excessive daytime sleepiness, characterized by persistent sleepiness throughout the day and often a general lack of energy, even during the day after apparently adequate or even prolonged nighttime sleep.
In individuals deprived of sleep, somnolence may spontaneously dissipate for short periods of time; this phenomenon is the second wind, and results from the normal cycling of the circadian rhythm interfering with the processes the body carries out to prepare itself to rest. The word "somnolence" is derived from the Latin "somnus" meaning "sleep".
Aging and dizziness: Academy of Neurologic Physical Therapy and National Institute on Aging Facts about falls: Centers for Disease Control and Prevention Vertigo overview: Cleveland Clinic
Characteristic symptoms are increased muscle tone (dystonia, such as clubfoot) and Parkinsonian features, typically absent in the morning or after rest but worsening during the day and with exertion. Children with dopamine-responsive dystonia are often misdiagnosed as having cerebral palsy .
For example, after a 4.8 magnitude earthquake hit New Jersey in April, people in the affected areas reported symptoms including dizziness, vertigo, nausea and just generally feeling a bit off.
Two-thirds of these patients wake up in the middle of the night, with more than half having trouble falling back to sleep after a middle-of-the-night awakening. [25] Early morning awakening occurs earlier (more than 30 minutes) than desired with an inability to go back to sleep and before total sleep time reaches 6.5 hours. Early morning ...