I dont use an alarm. Haven’t it years. Whether or not I’m refreshed depends on how late I went to bed.

Yep, it is the rule rather than the exception for many who are "natural" deep sleepers. I used to be one of those until I got overweight.

yes, it happens to me most days. Except the ready to face the world part, It's usually more like waking up without an alarm refreshed, and ready to browse HN and watch youtube.

edit: the waking up part didn't happen until I started working from home. I was always over-sleeping when I had to get showered, dressed, and commute every morning.

Hey, it happened plenty for me during the holidays between school and university terms.