The atmosphere doesn't really matter to me—basically if I'm home alone with some time to kill, that's good enough for me, and I'll spend 15 to 20 minutes doing it.
But I also like to do it as soon as I wake up—I swear it gives me a jolt of energy to start my day—or right before bed.
I like spending time with myself in any context, so the O is just and added bonus.