I can totally relate because that's what happened to me. I had neither reasons nor motivation to leave my bed so, I just stayed there
You gotta find something that interests you. You might think there's nothing but there's ALWAYS something. It could even be a videogame! It doesn't matter!
In my case, it was learning a new language and then I had more energy to do other stuff such as taking a shower everyday, cleaning, organizing my stuff, etc.
Now, I'm even able to work!
However, I'm still suicidal. That's just part of me but, it feels good not to be in a bed 24/7. That's not living and if I'm not gonna ctb, I won't spend the rest of my days like a zombie.