I don't usually face a big problem with legroom. My legs are cramped but they fit. The bigger problem is relaxing and sleeping. I can't read on planes for longe

I don't usually face a big problem with legroom. My legs are cramped but they fit. The bigger problem is relaxing and sleeping. I can't read on planes for longer than 10-15 minutes (I have to raise my kindle to my chest level in front of me, if I don't want to bend my neck), and the seat backs are just uncomfortable. I can't lean, can't sleep because my head rises above the headrest. Add the general lack of space in the standard economy seat and it's very uncomfortable for me.