We can stop breathing when we want to. We can also “tell” our body to do what we want such as moving, holding, typing, etc. So why can’t we just “tell” our brain to go to sleep immediately instead of having to wait for it to fall asleep.
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Maybe too many people killed themselves sleeping on command, and that selection got selected out by natural selection. It makes sense that we have a “warning system” just before we go to sleep, like we generally want to be in a comfortable, quiet, warm, safe place before we sleep.
Stopping our breathing on command may have uses, like when we want to stay perfectly still without being heard, or when we go under water or something.
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