As I answered before, there I don't really get into littlespace. However, the thing that makes me feel a kinda middlespace-y is actually listening to dumb Skrillex and other dubstep related songs from the late 00s and early 10s. I listened to that kind of music a lot in high school and it kinda triggers a feeling inside me of that era since I don't tend to listen to that genre anymore.
But also baby lullabies played over a speaker and are pretty good at hitting that "I feel funny" feeling if played in the right context >//v//<