Sounds like a tushie job to me.
HELP ME! i fell asleep on the sofa yesterday and when I woke up I was the sofa!! HELP people keep on sitting on me and i don't know what to do! I wrote this with my mind. (ive had superpowers all my life btw)?
Consider yourself lucky that you didn't fall asleep on the crapper!
Demand that your space be respected
Leave home when possible
Since you seem to be able to use your electronics, email or text your family that is sitting on you and tell them to get off.