“Too tired to sleep” is when you are watching television (or surfing the internet) even when there is nothing to see, yet can’t force yourself to get up and go to the other room to go to bed.
My problem is not forcing myself to get up and go to bed. I usually leave my computer and TV in my office and read some in a book after I lay down.
My problem is that after staring at the clock for 30 minutes, I'm back in my office on the computer because I can't fall asleep. This, after I can keep my eyes open to read any longer.
I also take a diuretic for my blood pressure and that gets me up every hour and a half to two hours to pee. It's a crapshoot as to whether I can fall back to sleep after if finish in the bathroom.
It's a vicious cycle.