* Mental activity, e.g. I play Lumosity. Not sure if it's scientifically veritable, but I do know that doing well on little games makes me feel better when I've hit a slump
* Aromatherapy - lavender and peppermint help me relax, which is great for bedtime
* Sex
* Herbal teas: chamomile and lemon balm help me relax, and clear my mind