I firmly believe that it is important that teachers express their vulnerability as much as their strength. As part of the SEL in my class, I post a laminated copy of the enclosed "Cranky Teacher Alert" poster any time I am overly tired (usually at report card time) or know I have a shorter-than-normal fuse because of life circumstances. It is one way I model self-awareness.
Be sure that the poster does not stay up more than a day or two at a time.
(For those wondering, B.I.C. stands for Butt In Chair. )
This is an editable Microsoft Word (.doc) version. With the paid version, you may customize the poster for personal use. The poster in my classroom has my name on it, for example.
You may also use my grizzly photo for another personal use project or web page.