I almost always have a day-after glow about me. The surge of endorphins and hormones takes a while to dissipate, and the memories creep up at random moments, letting me bask in my own self-knowledge. If the day after is a good one, I'll have a broad grin on my face for most of it. If it's a bad one, the afterglow helps me through it, providing that edge of distraction that reminds me that there's more to life than whatever thing I'm dealing with at that moment.