I usually go with lifting my arms or something like that - basically the simplest motion that still moves me towards my goal, or I think about what I want to do until I can identify the first motion I'm going to make. I use it for other things too.

I do this. I find the hardest thing to do when getting up is raising my head above my body. Anything that doesn't involve that is easy, even up to rolling out of bed, hitting the floor, and doing push ups.