I don’t sleep very well. I never have. My brain is too busy. Anxiety is sometimes the root cause of my wakefulness but it isn’t the only culprit. Sometimes I don’t sleep simply because I’m having too much fun solving problems. Not real problems, to be sure, just creative problems. I’d always done this. When I was a kid, I would lay awake at night imagining how I could pack my school bag more efficiently, or different ways I could rearrange my bedroom.