This is called sleep latency. Sleep latency can be a very serious symptom of certain sleep disorders , including sleep onset insomnia , delayed sleep phase disorder, shift work, restless leg syndrome or paradoxical insomnia . … and the person is falling asleep at inappropriate times there may be a sleep disorder such as narcolepsy , obstructive or central sleep apnea , periodic limb movement disorder, restless leg syndrome , shift work or advanced sleep phase disorder. …
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Cure Sleep Apnea Naturally | How to stay awake
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