I'm not sure if its concidered "normal", however its happened to me, and personally it was because of the realization of a new setting and the unknown of what may happen, but just know you're not alone on that, even if it's not "normal"

Definitely normal

Yes it is

Yes, for me, it is to learn the new layout, new surroundings, and neighbors, even where all the light switches are and am I going to comfortable there and my new environment and surroundings am I safe, so to sleep better I got a weighted blanket for good 😴 at night to halt my anxiety