Sometimes I have dreams where I'm in a room, but it resembles a totally different room.

For example, I'm in school but I'm also at home. It's really weird. Like, my classroom will look like my classroom, but it's in the same shape as my bedroom and it looks exactly like my bedroom, but I think it's my classroom. And when I walk out of my classroom/bedroom instead of seeing the school hallways, I see my house hallways. In the dream I think nothing of this, it's perfectly normal. But when I wake up I think to myself how weird that was. That's just an example.

Has anybody else experienced this? Please share some experiences. I imagine it's common since that has happened to me many times.