You Know It's Time to Call it a Night When

the following two things occur simultaneously:

1. You spend over 20 minutes looking for the lid to the Greek yogurt, which involves multiple rummages through the trashes and scouring both the garage and fridge before realizing that the peel-off foil you trashed was the only the lid that came with the yogurt after all.

2. You realize that the strange sound you have been listening to throughout the entire hunt for the nonexistent lid is your cat who has locked himself in your childproofed kitchen cupboard for who knows how long.

Yup, folks, bedtime it is for this tired lady.