Negative affects of too much sleep?

are there any? Like if it practically consumes your life, like a person addicted to sleep meds or someone that doesnt want to face reality, so they choose to sleep as much as possible. other than job interference, what happens physically? i imagine muscle loss and weightloss, possible severe dehydration? any other thoughts on this? im really curious...my aunt was once addicted to nyquil, so was my mother but both are no longer.