The sleepy question

When you're falling asleep, there are a number of questions you should never ask yourself. Here are just a few:

1) When is the threshold of sleep?
2) If I fall asleep, will I know it, or is it subconscious?
3) If I pass the threshold, how certainly will I stay beyond the threshold all night?
4) What if something wakes me up before my alarm?
5) Did I set my alarm?

All of these kept me in a dozing, sleepy state all night, and it felt as if I didn't get any sleep. However, I'm not sleepy right now. Hmmm....