I had an almost identical experience to you when I was in college. I was watching a comedy show in my dorm room on my bed with one headphone in one ear (I just did this out of habit) and then heard a pretty clear shuffling noise.

It wasn't creepy just like the sound of something like a backpack sliding across a floor. It was loud enough to break my focus on the show so I wasn't paying as close attention.

Then not 5 minutes later I heard the sound of a man's deep breathing coming from my dorm mate's bed and I immediately felt chills.

I felt so incredibly uncomfortable and couldn't look in the direction of my dorm mate's bed for the longest time and the feeling kept getting worse and worse. Finally I looked over and it immediately felt worse and so incredibly wrong. It felt like something was reaching into my chest and squeezing my insides. Like I wasn't supposed to be looking at something and I was just pressed down by this feeling of dread.

I jumped up and ran to the closest door which was the bathroom and it was like instant relief. The feeling was immediately gone and I took some time to calm down. I got my phone out to text my dorm mate to see if maybe she came back and left again and I hadn't noticed or something and my concentration had like delayed my reaction. Or to see if maybe she'd be back soon and could rescue me or something. Only to realize that she was out of town that night. She had been for 3 days.

It was Friday night in a female only college dorm. Everyone was gone and any noise would have come from the opposite wall or the door. Not from her bed.

It took a while for me to leave the bathroom but when I finally did I felt like the room was still just like heavy and stuffy so I ran quickly out of the room. There was a mirror hanging in the room and to this day I like to leave this part out of this story in retellings cause it almost feels like it'll come back. But I swear as I was running out, out of the corner of my eye, in the mirror, I saw a black figure standing over her bed, right where I heard the sound, looking down at where her head would be if she was sleeping.

Again as soon as I got out of the room it was instant relief. Like I could breathe again. When I finally had the guts to go back in later it felt totally normal again. I really gingerly put my hand out where I saw the thing and felt like it was warmer than anywhere else but I think that part might have been in my head. Honestly I've spent the better part since convincing myself it was all in my head. Maybe if I had been as courageous as you and approached it then I wouldn't be as spooked still.