Other brain activities like focusing, reading, remembering and so on, can be triggered actively whenever we want, but we can’t decide when we fall asleep. Besides some specific conditions must be fulfilled, like being tired, in a relaxing position, appropriate light…
In: Biology
I would like to point out that you do not have to be tired to sleep. In fact, with training, you can sleep as much as you want, whenever you want, as quick as you want.
Some branches of military even train their soldiers to sleep under just about any circumstances, quickly.
You basically need to turn your brain off. Sleep is kind of like the opposite of conscious thought. We tend to think of being tired as required for sleep because we usually sleep when we are tired but this is because it is easier to fall asleep while tired since being tired causes your brain to be less active.
You can read more [here](https://www.healthline.com/health/healthy-sleep/fall-asleep-fast#10-secs-to-sleep).
Edit: I learned about this when I was suffering from extreme depression and anxiety due to a bad divorce. Meditation is a great tool to help with falling asleep faster.
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