My thoughts in these situations always follow a path which covers the same points as other, similar nights, though not always in the same order.
So I'll be lying there on my side (I always kind of sleep on my side) and the more I try to get to sleep, the more I'm actively thinking about going to sleep so the less sleepy I become. As time wears on I get more and more worried (that is the wrong word, but there is no word to fill this gap perfectly, maybe fraught?) about the impending dawn as it marches steadily forwards to greet me; and I suppose in a relativistic way, I march on to greet it.
Then I'll have the clock debate with myself. I'm aware that some amount of time has passed since I did the final look at the clock before turning the light off and trying to go to sleep. However, time perception, the fickle beast that it is, is horribly inconsistent, so whether it has been 10 minutes or a couple of hours is a complete mystery to the bed me. Do I look at the clock to see how screwed I am for getting up for the early event the next morning, but making me lose all the progress I've already made at trying to get to sleep by sitting upright? Or, do I actively avoid looking at the clock, causing me an irrational anxiousness that will keep me awake, much like the irrational stuff already going on to have kept me up to this time already?
I've got around this little debate by convincing myself of something I'm not sure is true. It is the only unfounded truth that I can think of that I am reluctant to look up in my life in general since it saves me sleepless minutes and it harms no one. I tell myself that when I look at the clock on one of these nights and it says 2:00 or so and I have been in bed since 12:30, that although I wasn't sleeping in that time, I was lying down trying to sleep; which is almost as good. So when you start to work out the dangerous sums of (time you have to get up)-(time now) if it isn't very much time left to sleep then you can bodge it by adding on some proportion of (time now)-(time you starting trying to go to sleep). The proportion you choose to add on is the variable you change to feel better about the whole situation. This is the lie to myself that I preform.
And it kind of works. If you can convince yourself that there is loads of time then it is easy to get to sleep, you only have to trick yourself and not think too hard about it all.
When a night gets somewhat worse, I have a different thought, which is what I originally wanted to write this entry about. Say it has now got to 4:00 or so. (On a side note, don't you agree 5am is the worst hour? I can imagine being on a late night out till 4am, or having to get up early for something at 6am, but nothing good will ever happen at 5.) The clock debate has propelled itself into unreasonable stretches of logic, you have changed which side of you that you are lying on dozens of times, sleep finally seems improbable. I start wondering about the amount we forget about our nights sleep by the next morning. Certainly we forget most of our dreams, but we also forget a lot of the going to sleep process. And I wonder, do I go through this every night, seven days a week? Is this lack of being able to go to sleep a nightly occurrence and I forget about it by the next morning almost all of the time? Maybe I go through this very line of reasoning every night? I certainly go through it every night that I remember finding it hard to go to sleep. I don't want to be applying some sort of precognitive bias on it by assuming that I don't.
Somehow I will always drift off to sleep, as the need to sleep overrides anything else.
I've spent many of my Christmas Eves like this as a child; though not any more, since Christmas is no longer as exciting and I will usually have had many glasses of wine which will send me straight to sleep these years.
So whenever you know I have an exam or something to get up for in the next morning, you can reasonably predict I am lost somewhere in that scramble of thinking.
Goodnight. I'm off to bed.