Most people think that there is only one universe. They would be wrong. The number of universes is infinite being formed from every possibility that anyone could ever imagine. Some are similar to the one we know with minor differences. Others are very different.
Most people tend to slip into one or more of these alternate universes when they sleep. When they wake up they remember their journey as a dream and think nothing more of it. Though there are others known as Multiverse Drifters, or just Drifters, who journey from one universe to another inhabiting different bodies or inanimate objects. They don't have any control over where or when they go or what they end up as. As with others they mostly slip into another universe while they sleep though they can slip into another universe while they're awake. Unlike other people though they stay in the other universes for a longer time and usually don't return to the reality they had left. Drifters also remember all the realities they have been to even though it seems like a dream. Those memories don't fade like other people's memories do. Drifters also feel at least some sort of pressure even when their body dies. Drifters can remain with their body up to six days after death before moving on to another universe. Drifters are able to sense other Drifters in the same universe and the more experiences ones will help the newer ones if they find them.
Now you are about to become a Drifter. Where will you end up and what will you end up as?