In the clear moon light, Without fear... Insomnia

I had quite a strange and frightening experience last night, though in actual fact it wasn't really frightening at all. I watched a film til 2 o clock, and when I do that and turn off the T.V. afterwards to lie down and go to sleep I always find that i'm quite awake. However, it was 2am, so I figured I ought to try and sleep.
So I lay there for ages with my eyes closed, though they felt open because it was equally as dark with my eyelids open as when they were closed. And I just lay there. I remember knowing that I would fall asleep at some point but I started waiting.
I know people do this and it's perfectly normal to lie awake waiting to fall asleep, but then it frightened me, for some reason, that maybe I wouldn't be able to fall asleep because I was still thinking. I then tried to find a way to stop thinking, which clearly cannot be done because that in itself require thinking and you need to still be thinking to be aware whether you have stopped or not, and if you believe that you have stopped thinking then you quite clearly haven't because it requires thought to believe that.
Anyway, I got tangled up in that big arguement and then tried to drift away as I was taught to do in yoga relaxation. I found that it wasn't quite working as it usually does but I did get this incredible feeling of fading, even though all I could see was blackness. I got this feeling of getting further away from the physical blackness of my eyelids and into a weird state that I then thought must be close to sleep... though I then realised that I was thinking again and got all wound up. I got frightened because I did want to sleep and I was afraid that maybe this is what insomniacs must deal with and that it would become a habit.
I don't know why I was so afraid of not being able to sleep, and then that got worse by the fact that I thought I would fall asleep eventually but as I was not feeling sleepy now then how would I ever just fall asleep.
Of course, I realised I had fallen asleep when I woken up to my phone the next morning and it frightened me again how the last thing I had been thinking about was all of the above and I got anxious about when I had drifted off and why had I not known the last moments before I fell asleep.

I don't know why any of this felt so different last night compared to any other night when I've laid awake wondering when I will fall asleep. But I thought I would write about it... which reminds me... I must update my diary.