Thank you for your question, and I am sorry to hear about this problem. Unfortunately, this is something that will need further assistance from a physician in order to help both you and him return to optimal functioning. There are many potential explanations, but additional information is needed before a definitive answer can be provided. Some of his problems may stem from whatever is causing his disability. These problems can be either physical or psychological, and either or both may need to be treated more fully to help him. Obstructive sleep apnea
can be a common cause of sleep that is not restorative, and is sometimes associated with those who are overweight, have a large neck, or snore. Any chronic medical condition will also require extra energy as well, and so poorly managed conditions such as diabetes can also play a role. Malnutrition can cause fatigue, as can a host of other medical problems. Finally, even the poor sleep schedule that you describe can be part of the problem. Speaking with your doctor
will be a good step in the right direction, and he or she may be able to help you pull in extra resources to face this problem as well. Please speak with your doctor.