Hello, this has happened to me like twice a year for a long period of time. I am 43 now and after not having this experience for a while, it started again 3 weeks ago. First time during these 3 weeks, happened around 3am while awake and trying to fall asleep again. It starst with a half spinning and the buzzing/vibration starts right after if I allow it, because I can control it. If I open my eyes, it stops and if I want it to continue I just need to close my eyes. It always happens when lying on my back. I like the sensations, but at the same time I concerned why this happens. Have you found out something else relating with it? Thanks so much.