Have you tried to just get in bed before sleeping? It could help your body associate the bed with sleep.

I think that it could contribute to the problem and would be worth trying? I mean, I sit on a coach for 10 hrs a day sometimes, but I only really get on my bed if I'm intending to sleep. My psychologist at some point mentioned bed is only intended for sleep and sex. I think if you are sitting/laying and not doing anything for 4 hours it would be hard to not doubt yourself. I know habits are hard to change though.