Every day find something to be grateful for.
It might be the regularity of nature. Without it, how would you make coffee? And then there is coffee itself and its wonderful taste. What a marvellous, yet harmless, drug! And then there are the thoughts that percolate up under its agency. There are so many of them swarming and demanding attention. Some are even worth writing down. Your notebooks lay ready: they weren't destroyed during the night. And the pens too. Your fingers are supple and free of arthritis. And there is your library of books, thousands of them, to supply you with thought- and blog-fodder . . . .
But if you want to be miserable you should be able to find something to kvetch about.