I do this
I could always get back to sleep and lie in for hours now days I do well to make the alarm clock I beat it by up to an hour, Like you I had a bad patch a bit over a year ago and was getting 2 - 4 hours sleep but I noticed it!
Tired during the day etc,
Now 11pm to midnight pass out wake 6 - 6.5 hours later - not noticed any problems (yet) If I have a hard day either mentally or physically I will be tired earlier say 10pm so sometimes I fall asleep earlier, I would say 75% of the time I wake up after 7.5 hours sleep but I often still wake after 6 - 6.5 hours, I did some reading I'm putting it down to getting older
I'm the same about doctors not going unless I really have to!
Ref falling asleep in X mins - My dad what a character didn't matter to him what time it was if it was time to sleep he just closed his eyes and went to sleep - it was a gift
As for my good lady wife - she says Goodnight and if you haven't replied by the time her head hits the pillow your to late she is asleep, I read average is 6 - 8 minutes to fall asleep she does 6 - 8 seconds
However she has more recently complained that she can't stay asleep especially on a Sunday morning when she would like a lie in (just cause you can) she is still up before 7am - no side affects just can't sleep like we used to.
To keep things on an even level my eldest daughter can sleep for days literally, Mon - Fri up at 7am for work Friday night she will go to bed late and can happily sleep until late afternoon on Saturday - if we haven't seen her by 2-3pm we usually wake her up - I say it's up to her, she is up for work it's up to her what she does with her free time, and sleep is a cheap hobby
TLDR: I'm the same as OP so it the wife