Insomnia - difficulty falling asleep, difficulty staying asleep, awakening too early, and not getting refreshing sleep, Sleep-Wake Schedule Disorders (Circadian) - Abnormalities in sleep-wake schedule caused by time zone changes, shift work or changes in total sleep time from day to day, Restless Leg Syndrome - Strong or overwhelming urge to move the legs when resting or before sleep, Sleep Apnea  - Sleep disorder with frequent pauses in breathing and frequent awakenings, Narcolepsy - Brain's inability to regulate the sleep-wake cycles normally,

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