This was a fun prompt! I completely agree with this one, and I feel like lazy days can help me tackle heavy days, especially with classes. I always need my caffeine companion, however this can set the day off right.
I can even have a lazy day and night (such as yesterday) where I stay up later, but I can still lock in, come the morning. I have always considered myself gifted with this ability, which I greatly appreciate that I can do. Sleep is a tough subject, and while I have to deal with issues falling asleep, I still have the upside of handling the lack of sleep when I need extra time for things like late-nite blog posts and homeworks.
I would even extend on this and say nighttime is my most productive time for work. Recently some server problems had kept me up diagnosing issues!