What happens when we sleep

Lack of sleep is a common complaint but for many, falling asleep involuntarily during the day poses a very real and dangerous problem. A new study from the Montreal Neurological Institute (MNI) at McGill University demonstrates interestingly, that sleep-wake states are regulated by two different types of nerve cells (neurones), melanin-concentrating hormone (MCH) neurones and orexin (Orx) neurones, which occupy the same region of the brain but perform opposite functions...

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