"There’s an ability called Dream Traveling, or if people want to be more SPECIFIC, Dream Teleporting. If someone has that power, they can teleport/travel through different dream realms (Yes, there are multiple dream realms), like the jokers of the card kingdoms. They could make their own realms, but it has its side effects when they wake up (Examples: Exhaustion, motion sickness, etc…). When they try to use the ability, however, to make it mess with the reality on earth, it would have HUGE consequences, and it could take weeks, months, and even years to fix it!"