I've had hypnic jerks for a long time but the sounds/sensation just started about a week ago. I'll just be dozing off and be startled awake by a noise. At first it took a few seconds to realize what was happening but I do 'feel' it. I can feel it move. I never get enought sleep, so I can understand where fatigue and stress come into play.

Thanks Kimmy and Fayerody. . .