https://blog.fitbit.com/sleep-deprivation-is-making-you-fat/
http://www.health.com/health/condition-article/0,,20232959,00.html
https://science.howstuffworks.com/life/sleep-obesity1.htm
https://www.medscape.org/viewarticle/502825
https://www.webmd.com/diet/features/your-hunger-hormones
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC535701/
https://www.ncbi.nlm.nih.gov/pubmed/18564298