I have been getting up at 6 am this summer (compared to 8-9 before this summer). It's because I moved into a new house that the bedroom has this window high up

I have been getting up at 6 am this summer (compared to 8-9 before this summer). It's because I moved into a new house that the bedroom has this window high up with no blinds (and since it's high up it would be a pain to install blinds into it). And the sun shines in around 5-6 really bright through that window and wakes me up naturally (presumably at the bottom of one of those sleep cycles where you should wake up to feel refreshed). I get up and start work immediately (work from home) and get in 3-4 hours of focus time before meetings start and it's made me a lot more productive. The morning momentum also carries over to the rest of the day and I get more done then too. I would recommend such a window to everyone although unfortunately it's not possible for most. When the winter comes I'm afraid the sun coming up later will make me get up later and may invest in some sort of timed light in my room to slowly turn on at the time I want to get up.