I don’t play completely laying down. I rest my neck on a pillow and find it far more comfortable to play for long periods of time. I can relax and fall asleep watching movies or playing a relaxing game if my neck has support.
I also use my tablet with emulators like this. I have a stand for my tablet which holds it above my head so I can lay down on the couch and play games. People need to realize the importance of having screens in the right position is only going to get more and more important in the future. I’m older already, so I reach my limits faster than the younger crowd.