For example, if you normally watch TV, shower, drink a cup of herbal tea, snuggle with your stuffed animal and fall asleep at 10pm, try to do all those things in that order. Try placing a blanket over the couch, tucking it under the front and back of the bottom cushions. If you are sleeping on a couch made of a slippery material, such as leather, make sure you pad the floor with something. I told my wife and youngest daughter what I learned about him. Temperature affects your quality of sleep.
Sweatshirts and sweatpants might work, if you can lay them flat.
He was quite good at making things. He said he had no family, no education, no steady job. I want him to be happy. Consider opening a window or adjusting the heat. A fitted sheet might not fit, so try tucking in a top sheet. This is a kid who never had a chance to be a kid.