Deep sleep within a regular pattern is normal.  But if you are oversleep thew could be many reasons. Diabetes,  heart related problems, hypersomnia, obesity, depression etc.  Consult your doctor, if required you many consult a Pulmonologist to conduct a sleep study or polysomnogram (PSG), this is a test that electronically transmits and records specific physical activities while you sleep.

I understand your concern. However more clarity is needed regarding your problem to decide if it is abnormal and also severity of the condition. It is easily manageable with appropriate suggestions so that dysfunction due to the same can be reduced and your quality of life will improve. Some counselling sessions and if needed medical help might be useful for you. I would also be more than happy to help you with that if you are looking for further online information. You can directly consult with me through Practo as needed. Online chat consultation is available.