I was in religion class 
and watching The Ten Commandments. Luckily, I was hidden away in the corner of the class and I was tired, probably the most tired I’ve ever been. I closed my eyes for about two minutes but kept having these recurring… dreams/HI? Let me explain:
-I would close my eyes for a minute or two. My thoughts would drift off.
-I would then think about something obscure, I was thinking of Moses hitting me with a stick. But the second he hit me, I jolted up in my chair as if I had really been hit. Kind of a muscle spasm.
-This repeated, and happened with weird images such as pressing refresh in firefox, and having dots zooming in at me.
Is this HI? Was I dreaming? Or do I just have a very weird daydreaming imagination that affects my physical body? (By the way, I’d been up since 5:30 so I was extremely tired, and I went to bed at 12:00 the last night.)
I mainly got these when i was in school too, i would like, Dream that i feel off a cliff and JUMP up out of my desk and freak everyone out next to me, I think it is just really strong HI
Haha, so I’m not alone…
(Everyone thought I was crazy when I leaped out of my desk three times in ten minutes for no reason.)
I do that to when I’m in class (especially today because of the EOC exams). I’ll have nothing to do for like thirty minutes and so I close my eyes and it’s like one minute I’m in my classroom and the next I’m revisiting my past. This is more vivid than if you are just staring into space. Most of the time it’s silent but there have been times when there would be a noisy (like the video you mentioned for example) distraction (that would not affect it btw) going on in the background.
When I return back to consciousness I usually snap back and it feels like I’m dizzy for a split second. lol (is that bad? oh well)
This is why I always try to get at least 7 and half hours of sleep. If I get below that, I know that later in the day during class that I will get tired, doze off, and wake up from my head slamming the desk. I had to repeatedly explain why I’m banging my head on my desk while the teacher is teaching
Same thing happens to me, except in all the warm-ish classrooms whether I get enough sleep or not. The temperature just makes me drowsy then I start to nod off and will jolt awake in a few minutes. One time I had a full length dream while sitting at my desk and when I woke up I had been out half of the period.