A hallmark of mine for many years was pushing myself every day to get as much done as was possible on a given day.
I still push myself, but now, I'm at the point where I realize that, you know, some things can wait and it's just better to get to sleep.
There's a great song by Alabama on this topic. Listen to it here.
I heard this song on the radio one day and just remembered the idea of it. Sent an email to the station and after a few back and forths, the assistant producer got me the info I needed. Very cool! Then, I bought the song.