Happened to me last night. I'm 17 male and I've been having this happen to me over the years. I find that it happens on the nights where I cannot sleep in bed until after a few hours of trying. Then when I close my eyes, I feel as though my brain is distorting itself from reality (buzzing, vibrating etc) very hard to describe the exact feeling but it does feel good. I also am able to intensify the feeling by looking up, or if I open my eyes the feeling goes away completely. Idk if this is just me but this also sometimes leads me into sleep paralysis or lucid dreaming. Another thing that happens to me other than this is when in the same scenario, instead of my head buzzing, i'll feel like I'm falling (but not the type of fall that you see other people talk about) the fall feels more vivid, and I am able to move, however as the fall progresses, it slows my ability to move. I am also able to exit and re enter this state for as long as I don't give in completely to the fall, and fall asleep. This usually then is accompanied by sleep paralysis if I give into the fall. Super weird but honestly cool. I'm really intrigued as to knowing what this is and am glad I'm not the only one who experiences this.