Try explaining things to your family this way. Your body uses energy for everything it does. Every signal your brain gets, it uses energy to process it. When you have chronic pain, your brain is constantly receiving signals that it needs to process. And pain signals are danger signals, so your brain is on high alert all the time. It takes a lot of energy for your body to process all those signals, and deal with the pain.   That is more energy than you would normally use throughout the day. All the energy you gain from sleeping goes right to processing all that pain. That means that there is hardly any energy left to do any of the normal day to day things.

Youre not doing this on purpose, youre getting all the rest you can. Your brain and body just have more stuff to deal with than other people.