Try not to think about this desire to sleep with being a desire for death. It's good that you have articulated that though. The reason you prefer to sleep is more about how you get a break from the stress of dealing with life and how overwhelming it can get for you.

I have that challenge myself and my husband can most definitely add to the challenge because he can also get angry and frustrated. Your husband is frustrated, he probably has a deep desire to "fix" and he is at a loss.

Mental illness takes a toll on a person physically, it's exhausting to try to help "self" when it comes to the stress and anxiety of dealing with the challenge of a mental illness.
It requires a lot more patience then the average person understands.

Yes, your husband would benefit from having a therapist help him with this challenge so he doesn't feel so alone with it.