There are some good suggestions, but I want to mention that you are being a bit hard on yourself. Pressure will not help creativity. Give yourself permission to relax. And realize that it gets harder as you get older, but don't punish yourself for time passing.
Echoing the others here, give yourself time to let your mind wander.
I'm the apologetic drunk. I am SO sorry to everyone. Usually apologizing for being drunk or just my existence in general. Also, before I get to that point, I usually test to see if I feel (or don't feel?) my teeth.
Just picked up a recipe for apple cinnamon Blondies I'm going to try this year.