http://blogs.kqed.org/mindshift/2013/01/why-sleeping-may-be-more-important-than-studying/
How Sleep Protects the Brain
http://www.scientificamerican.com/article/how-sleep-protects-the-brain/
Peppermint and Memory
http://informahealthcare.com/doi/abs/10.1080/00207450601042094