When it comes to sleep you just can't get enough. Experts have always recommended that 7 hours of good sleep is essential for better health. But what if you sleep more than that? Although sleep is extremely necessary for relaxing and revitalizing the body's processes oversleeping can have its own adverse effects on the body. What causes you to oversleep? There can be a lot of reasons why people tend to oversleep. Interrupted sleep during the nights (sleep apnoea) or a neurological condition called narcolepsy which affects the part of the brain that controls sleep could be the medical reason