They are called hypnic jerks. They are perfectly natural, and thus have no affect on the success of a WILD (unless, as with Hiros's experience, he didn't know that the twitches don't jeopardize WILD). They occur most often during Alpha waves (relaxed, drowsy, but not too deep), and they also occur more often in someone who is physically fit than a person who isn't.
As for the accompanying scenes, yeah, those can startle! I mean, sometimes you just twitch, other times you think of turning a doorknob, other times you trip! Many times these scenes are only flickers, lasting only a fraction of a second.
When you feel hypnic jerks, rejoice! It means your body is in the perfect relaxation and comfort for WILDing (if you don't feel them, it's O.K., because it usually doesn't happen every night).
@other question: It depends on the person. If you have trouble staying aware without waking (waking=at least getting out of bed), then you should WBTB. If you have trouble getting back to sleep after waking, you should either lessen the time you are awake during WBTB, or if that doesn't work (and you still can't fall back asleep), don't WBTB at all.
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