I think those episodes are pretty common, I dont dream explosions, I usually hit a wall riding a bike or sth that has to do with falling.
I researched that while the brain falls in sleep mode, it send out chemicals to stop motoric functions to protect itself from movin/reacting while being in REM phase, and that during the switchover it is possible for some impulses to come through causing the body to shake for a milli second while already being in dream mode
I usually wake up from those and go right back to sleepj