9. Restless Leg Syndrome
Sounds comical – having a strong urge to move your legs while trying to fall asleep -but it can be very unpleasant. And some people who suffer from RLS feel not just an urge to move but burning, prickling, itching or tingling sensations. The condition makes it very hard to fall asleep and can result in depression and daytime sleepiness. Source: American Academy of Sleep Medicine.
10. Narcolepsy
People with narcolepsy can fall asleep at any time without warning. They can stay asleep for a few minutes to a few hours. Not good if you’re driving a car or doing something else that requires concentration. Source: National Institute of Neurological Disorders and Stroke.