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
To fall asleep your mind needs to be fatigued, the neurotransmitters in your brain should have been depleted and there should be no or minimal external stimulus like a quiet place and dim or no lights. This is because our brains have something called the Reticular Activating System. This is a network of fibers that sends information to the brain and different parts of the brain get stimulated in return. The brain can be stimulated by stimuli like light, sound, pain, heat, cold, anxiety, excitement; none of which let us sleep since it fires the brain. So if you work out and tire yourself or meditate, which calms you down, (controls the firing of the brain) you could sleep at will. There are plenty of things that can be done to help one go to sleep by calming down the brain or tiring it.
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