Eli5: Why cant we just signal to our brain when we want to fall asleep?

Question

When we lay down at night why our brain does not recognize it and make us fall asleep much easier? Interesting that we have control over so much things but not our own body.

In: 93

Answer 1

As with all questions along the lines of “Why don’t our bodies do ___?”, it’s because our bodies are evolved rather than designed and so this trait was not something that was required for us to reach our current evolutionary state.