I think I spent the whole night in the 4's. It's not something I aim for, as a bit too close to hypo territory for comfort but I still love it when it happens

. Finger prick said 4.9 upon waking, Libre said 3.9 with an almost perfectly straight line between 3.1 and 3.9 (all in annoying red of course) so I suppose I've been hovering between 4 and 5.
Wish I knew how I pulled that trick off though. If I knew I would repeat it every night but just the slightest bit higher
The walk yesterday morning may have helped but I don't think it's very likely as it hasn't happened before on days with about the same intensity of exercise. Had a late and quite carby dinner and I was kind of annoyed with myself for eating so late that my after dinner numbers had only about settled when I went to sleep, so food isn't a likely cause of the flat line either.
Back to the color of my underwear I guess (haven't worn socks for weeks so we can rule that out).
I'm afraid I'll never be sure, but I'll scan my sensor a bit more often than usual today, only to admire that pretty line on the screen again