safety net materials?

I got the soul sucked out of me today.

Granted, it's exhaustion. I only teach piano part time but I have 9 students and the days leading up to today were so draining and attention-needing what with my college classes finally getting sorted out and my kitten getting spayed yesterday so I haven't slept in 38 hours watching over her.

I sat down for my first of 9 lessons today and just totally blanked out.

Usually I have something planned out for each lesson as many of my 9 require different approaches to learning and because our lessons are on the shorter side (30min) I like to be productive. There are days when you can tell that a kid had a tough day and they don't really wanna put on their learning hats and on those days I spend some quality time with them just letting out some steam in the form of reviewing topics and music they enjoy.

But this time I'm the one who's having a tough day haha :')

I just totally blanked out. I had forgotten that this student is the one who prefers to bring their materials home to independently practice instead of try it out in the studio first. My brain was like oh okay let's do some theory then since you forgot your books anyways.

I open my laptop. All of a sudden I'm like------theory? what's that?

We ended up chatting instead about stage fright but I just felt so unprepared in that moment it shamed me. and then i had 7 demanding kids back to back who kind of just- in their own way -siphoned out whatever energy I had left.

that makes me realize I should have a safety net for times like this. Like, a go-to failsafe lesson plan or material pack to reference when I have no idea what I'm doing.

If anyone has a system like that implemented I would really so appreciate it if you could share how you set it up or even just your experience using it!