If anyone has a baby, I feel this is what its like having a new born at your home for the first year. I slept HARD before I have ever had kids, but for some reason, that first year, I slept very lightly and would wake up to a cry.
I was thinking more about "my room", I've moved because job reasons 3 times in my life, and I always start renting a room in the new place.
First day is always the same, clean up (just in case) and try to make it feel like my room, personally.
Always sleep well, but with the time, sleep better when certain "things" are fixed to my taste in the room.
I think this maybe even hard-coded in our ADN. Because to be here, our ancestors did search and modify many caves.
When I got old enough to go out places with my friends and come home later at night (past 11, for example) my dad said it took a couple years before he could fall asleep without hearing the garage door open, and he's a deep sleeper who's never had any issues sleeping anywhere.
We've joked he's going to miss his own funeral because he's slept in.
I think sleep has some innocence until you lose it and afterward it changes permanently. It has in my life so far.
Yeah, it's called 'getting older'.
Aside from that, before and after they've grown up, I'm a pretty heavy sleeper :)