Why does this work at night?

Question

when at night sometimes when i can't sleep it work like 50% of the time i make myself yawn (like just makin the sound with my mouth)and think to myself man I'm so tired when I'm not then i start to feel tired and fall asleep?

Answer 1

You are very good to be  in tune with your psyche. To be able to do self-suggestion takes a lot of training and self -dscipline.  Do you meditate and do yoga?

Answer 2

You are sending messages to your brain through familiarity with the sound of the yawn, the movement your mouth makes when you fake yawn, and the idea that you could be tired.