When should I wake my father up to preform personal cleansing tasks?

My father has been admitted to at-home hospice care today. Mostly I am alone with him and am responsible for his personal care except when a certified health aid comes once a day. I aked the hospice co-ordinator a million questions, but forgot to ask this; Do I wake my Dad to perform personal cleansing tasks? My feeling is to let it go for an hour maybe, but longer than that I fear the damage to his skin and possible sores. Any general guidelines keeping in mind that it is pretty painful for him to roll over, even with my assistance and the use of a draw cloth.