I frequently do the opposite of that, instead of convincing myself im awake while I sleep, I convince other people im awake when actually im asleep. I never have any memory of it afterwards, but according to what my family has told me ill have short conversations while asleep and not be aware it ever happened. I discovered this when my mom woke me up and said my food is here, I was confused and apparently she asked me if I wanted to order food and I agreed in my sleep. The extent of this strange ability is to just yes people to death, because I definitely wouldnt have actually wanted food at that time, I was too tired to even eat it.