Hi, I have had this issue for over six months, When I wake at around 4 or 5am each morning I feel my body shaking inside. Once I open my eyes and focus it vanishes in 5-10 seconds. I then fall asleep and the next time I wake it does the same. Sometimes this can be 1 minute later and sometimes and hour or two. At its worts it can repeat 10 times before I actually get out of bed. I don't take any medication, don't drink, smoke or have caffeine. My GP suggests that it is adrenaline waking me up as because it stops as soon as I open my eyes. If I wake but keep my eyes closed it continues. I don't have any other symptoms. Before this started I was diagnosed with Benign paroxysmal positional vertigo (BPPV) and had a couple of weeks with serious vertigo until I used the Epley manoveure. I have suffered from anxiety and panic attacks around the time it started but would consider myself 95% sorted in that respect. I am yet to read on any forum that it is linked to anything serious but at the same time it seems a common thread is that it affects people with some form of anxiety.