On: Researchers identify sleep as a reason why persona...

[samatman]

This may sound like pedantry, but I would call 6.8 "almost seven hours" not "6 hours and change".

I track my sleep as best I can, and nearly-seven is sustainable, while a bit more than six on a consistent basis leaves me feeling pretty wrung out.

The extra 45 minutes we're talking about here are likely to be mostly REM, given how intensely I dream when I start napping to make up a deficit.