a hard day's night
A fancy way of saying you had a terrible day, and you’re only thinking about it now because you’re too tired to do anything else. Like when you’re so tired you forget your own name.
I had the worst day ever, but now I’m too tired to care.
My day was like being stuck in a blender, and now I’m too tired to even complain.
I worked all day and now I can’t even think straight.