It's been a long day and it just feels like kicking a dead horse.
But, you're right, who knows what tomorrow may bring? This is for your eyes only, but tomorrow never dies, so perhaps I should look on the bright side of life.
When I was on Her Majesty's Secret Service we used to say discretion is the better part of valour and that you could always die another day. Some said' "You only live twice" but they were talking out of their arrse and they should have the living daylights kicked out of them.