Dreams are manifestations

 

of the unconscious mind, activated during sleep.

Become more self-aware. When you feel something, ask yourself: why do I feel this way? When you want to do something, ask: what is actually motivating me to do this?

By raising more thoughts into the conscious realm during the day, less stuff is left in the unconscious to become dreams during the night.

 

Reducing screen time in the evening might also help. Read a paper book.