If would be good to discuss this with TOm's doctors and nurses. If you are exhausted you can not help him in an emergency. He needs to be told when he can call, when he can wake you up, what hours you need to sleep unless he has an emergency. They need to discuss this with him. If you are entitled to any medical help at home, please get it. The caregiver's needs must be taken into account and often the patient does not realize how burdensome and exhausting their care can be.