Sometimes, a true statement acts as a reminder as to a true state of mind.
We all do it, ‘fake it till we make it’.
It helps short term, to stay aware of a bad mood and behave like normal to prevent creating a mess. For example, yelling at someone who deserves it, but we need to tolerate (like a troublemaker co-human).
Long term the ‘grumpy Mike’, may need more serious action like 8 hours sleep.