I found that caffeine caused bad status.
I have nothing to write this morning.
I'm reading a book named Elon Musk. In my judgement, this book's English is relative easy to read, so I can recommend this book for English learner like me. Books something like biography of successful person are reassuring for me because these don't have bad endings in general.
My condition is great this morning. Yesterday, I stopped drinking coffee at home and change medicine for hay fever. The medicine contains caffeine. My fatigue was banished. The cause of my bad status was caffeine.