Mom can't sleep at night even after hard work.sometimes dream at midnight about what's wrong with her and speaks unmeaningful.how to get rid of?reason?

Confusing question: Your mother has sleep difficulties. What does midnight & dreaming have to do with that? Nightmares? She also talks in her sleep? You are indirectly implying a psychologic cause to her sleep disorder, which in fact is quite common. She should confer with a doctor, psychologist, or other counselor about possible stressors. If none are identified, the next step for serious sleep issue is a sleep test.