While the symptoms of insomnia are similar no matter what the cause, hypersomnia symptoms may vary widely depending on the underlying etiology. Fragmented, low-quality sleep may be due to sleep-wake disturbances in the brain in both disorders, and/or hyperarousal of the nervous system in insomnia. Fragmented sleep refers to frequent awakenings that interrupt sleep cycles, leading to less time spent in the deeper, more restorative stages of sleep. Though the symptoms of insomnia and hypersomnia appear to be markedly different, the disorders have a few possible symptoms in common: fragmented and low-quality sleep. Symptoms of secondary hypersomnia, however, typically begin in adulthood, when medical issues and other sleep disorders are most likely to occur.Ĭore symptoms of both primary and secondary hypersomnia include: In contrast to insomnia, which can occur at any time of life from infancy to old age, symptoms of primary hypersomnia most often begin in childhood or adolescence.
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