Valley Sleep Center. “Can’t Sleep? Maybe Your Brain Needs a Cold Shower” accessed August 28.. 2015. http://valleysleepcenter.com/coldshower/
Mayo Clinic. “Stress and high blood pressure: What's the connection?” accessed August 28. 2015. http://www.mayoclinic.org/diseases-conditions/high-blood-pressure/in-depth/stress-and-high-blood-pressure/art-20044190
Yilmaz MB, Erdem A, Yalta K, et al; “Impact of beta blockers on sleep in patients withmild hypertension: a randomized trial between nebivolol and metoprolol”, Adv Ther. 2008;25:871–883.
http://www.cdc.gov/nchs/data/databriefs/db127.pdf (4% adults in US)
HealthDay. “Prescription Sleep Aids a Common Choice for American Insomnia” accessed August 28. 2015.