Energy and focus improvements I did not expect

I came into this expecting recovery and sleep benefits. What surprised me was the daytime energy and mental clarity. Around week 5 the afternoon slump I'd fought for years just sort of faded.

Hard to say how much is direct versus a downstream effect of finally sleeping well. Either way, my focus at work is the best it's been in a long time. Anyone else notice cognitive or energy changes they weren't anticipating?