I play Microsoft Solitaire almost every night. I dominate. A couple years ago I went through a stretch where I couldn't even place in the top 25 in a tournament, and then I realized my brain couldn't work because of all the wildfire smoke. The moment it finally rained, I was back to being a machine.
I recently had to stay in a random airbnb for work and despite a fairly restful night woke up feeling absolutely awful and more tired than I had been when I went to bed. Then I realized that my meter was reading over 2k.