When I can’t sleep, it isn’t that I can’t fall asleep to start with — it’s that I wake up either hot or revved-up or both. I tell myself the feeling is from a hormone, maybe cortisol, which will clear out in about twenty minutes, and until then I should relax my body by focusing on my breath. Of course, going back to sleep isn’t always that straightforward. What is it like for you, if you awaken in the night? Sunday Jan. 17, 2021, 4 AM — I woke up two hours ago and am not sure I’ve been back…