This is a really bad idea. Your shoulders and back muscles will go for a toss because a move along the y-axis on a desk translates to a Z-axis move when laying

This is a really bad idea. Your shoulders and back muscles will go for a toss because a move along the y-axis on a desk translates to a Z-axis move when laying on your back. I used to use an iPad laying down, and tiny movements that required me to move my shoulder up and down messed me up royally. I speak from experience.