I dreamed that my dead mother gave me 200 yuan.

This is normal, because we know this dream. When you sleep, the neurons deep in your brain are still active, which means that when you sleep, your brain is still actively involved in creating a dream. Why don't we go deep into restoring his meaning, because it is only the result of brain activity and some dreams. If you have to say what this means, it means that healthy old people are more active.