Hey, it's me from the next day. Can confirm, my previous consciousness terminated the moment I fell asleep and I'm a totally different person now.
But seriously, I started wondering why so many people have trouble proving this to themselves and so many others don't. Maybe it's something similar to how about half of people don't have an inner monologue. I personally do and I'm curious to know if the people who aren't sure they're the same person every time they wake up are the same people who don't have an inner monologue.