My hedgehogs has gone into a ball and wont come out is he ok?

i found a baby hedgehog about a week ago and couldn't leave it as i couldn't see its mother plus it was near the road. so i brought it home and kept it in my spare rabbit hutch. im letting is go very soon but this morning i went to cheek on it. and its in a really tight ball and wont come out. hes alive but im just really worried. it has been raining heavily all night though. is this normal ?