Do you ever have the sensation of your bed shaking violently while either falling asleep or waking up?

This has happened to me off and on pretty much my entire life, in a variety of beds and a variety of houses. Sometimes it is just a little jiggle, other times it feels like the bed must be hopping up and down, usually only lasting no more than a second or two. I’m reasonably sure that the phenomenon I’ve been experiencing is a natural one having to do with your brain shutting off the motor controls for your body during sleep transitions rather than a paranormal one having to do with either a haunting or poltergeist* manifestation.

Once or twice I’ve experienced the transistion from sleep to wakefulness with alarming lucidity. One of the most memorable times was once I dreamed I was standing up, and actually seemed to feel the gravity shift a full 90 degrees as my body realized that I was actually lying on my back rather than standing up as I became fully awake. The other was when I was at the beach with Dan and dreamed that I woke up from a dream of him strangling me to him sitting on the edge of his bed in his underwear and then woke up for real and actually seemed to see him dissolve from a sitting position to a sleeping one. I generally don’t dream in homoerotic imagery, so I’m pretty sure that’s unrelated to my bed shaking problem, I just mentioned it because it was a neat experience — the transition from sleep to awake I mean, not being dream-strangled or dream-ogling Dan’s tighty-whitey clad body.

Anyway, am I the only one experiencing this?