Evidence that I didn’t sleep well last night: for a split second I thought this was actually a note I made. I even remarked as to how neat I made it.

The neatness is what eventually tipped me off. None of my notes look as good.

@jasonmcfadden Oh yeah. It's called Calendar and it's useful for seeing which days you've written Daily Notes, including days in the future. I don't use it super often — it's in the right side-bar which I mainly keep closed — but it has come it handy several times.