I can usually sleep like any other person but about one every two weeks (sometimes several nights in a row) i find it really hard to fall asleep and i can be lying awake for between 2-3 hours.

Take last night i was hoping to be falling asleep at 05:00 but knew it was going to be one of those nights when i was still wide awake at 05:30, i tried for what seemed like an age till had to look at the time, it was 06:33.
I was still awake at 07:30. Soon after i fell asleep.

The worst was several weeks ago when i was trying to get to sleep at 04:30 and was still awake at 08:20!

My point is, is this helpful in being lucid. Of course not being asleep will never help.
But just curouis.