fantasize

Example:He likes to imagine himself as a famous explorer discovering new lands.

Definition:to form a mental image of (something that is not actually present)

Example:She occasionally daydreams about becoming an astronaut and exploring space.

Definition:to imagine pleasant thoughts or scenarios while relaxing or not concentrating

Example:Whenever he feels upset, he likes to dream about his happy childhood.

Definition:to have or experience visions or thoughts while asleep or while imagining