Thread: I dunno what this is but...

This has only happened like 3 or 4 times to me, while I'm almost asleep lying in bed...

I'll be trying to go to sleep, when BAM! I feels like something has hit me, but Its like I don't feel any pain or anything.. its sorta hard to discribe, and when It happens I'm mostly awake... and that wakes me up anymore. I happened a few days ago, but for some reason this one felt like it was a gunshot, I don't know how I knew It was a gunshot, I just did... I really don't know if I was dreaming or not, I don't think so because I kinda... felt it. So like... is this just me imagining things, or what?