Is ~6 hours low ? After I started working out before work I started getting up ~6-6:30 but I can't go to sleep much earlier than 12 (I just end up rolling around in bed) - but I've been doing this for so long now I can't really tell the difference. I sleep over on the weekends but I don't notice extra productivity or being rested.
I'll try to go to sleep at 22:30 this week to see if I feel different.
Personal needs vary, but also know that you can stabilize on chronic low sleep and not even know it. I did a few years getting ~6 hours most days, and felt ok. I eventually ended up getting 8-9 for quite a while (months), recovered, and now quite literally feel better than I knew I could.
A simple, funny example: I always thought I was prone to getting songs stuck in my head. It turns out I'm not unless I'm sleep deprived, but that was such a constant state that I never knew there was an alternative.
Yea, I've been feeling 'off' for a while now but so many moving things and any one could be it - will try sleeping more for a week to see if it makes a difference.
As the article mentioned, "low" is relative as different people require different amounts of sleep. 6 hours might be totally fine for you while someone else would be a complete zombie.
I'll try to go to sleep at 22:30 this week to see if I feel different.