I don't think either that your mom would haunt, it seems more likely that some stuff happened with you two in the past that you couldnt get over and still need to deal with. Although my mother is still alive, I have a lot of nightmares her shouting on me for example.
Our normal sleep is extremely important, maybe you should consider taking medication for falling asleep (and staying) if you're not already.
I sympathize with you, don't give up!