I used to pace in my room fairly regularly for about an hour a day. I'd do this while listening to music and I'd basically be envisioning situations that I wish would happen (not really reminiscing anything or hoping I did something different in the past, but unrealistic situations nonetheless). I try to limit myself from doing this because I really don't it's "healthy" lol
My younger brother who is 17 (and I believe doesn't know a thing about autism, but he's a smart determined boy with life goals and such - unlike me), paces in the living room with no shame. When he was younger he would be *angry* and somewhat throw a fit if he didn't have time/wasn't able to pace. Now though, he really does prioritize pacing more than other responsibilities whenever he's time constrained. And he'll do this once when he wakes up, and several times (like maybe 3-4x) after school for like 15-30 minutes. When he does it, he makes noises too (not only with his walking/occasional stomping, but also verbal noises). I don't know what goes on in his head, but he gets really aggressive and fast paced sometimes - I can't even piece together what's happening with whatever clear words I manage to hear from his mouth during these episodes. Sometimes he "sings" or chants, or whispers or makes sound effects, but I don't know y'all.
It bothers me greatly. It's so weird to watch ... sometimes I'm tempted to record him (blur out his face of course) and upload a video online to get some feedback on what's going on, but I feel that's also mean and would ruin him if he or someone he knows manages to find out about it.
Personally I don't make noises when I pace, I have caught myself making facial reactions (which my bro does as well), but that's about it and it's only in my room. My brother just does it in the open in the living room (sometimes when guests are around, he'll still pace, but he actually paces - no sound effects or anything - and he walks slow back and forth. I've sensed the uncomfort some guests feel when they notice him doing it, but
) Both my parents and my brother just refer to it as exercise; I for the life of me can't comprehend why my parents just nonchalantly accept this habit.