2. Lawson, Christina C., Elizabeth A. Whelan, Eileen N. Lividoti Hibert, Donna Spiegelman, Eva S. Schernhammer, and Janet W. Rich-Edwards. “Rotating shift work and menstrual cycle characteristics.” Epidemiology 22, no. 3 (2011): 305–312; Stocker, Linden J., Nicholas S. Macklon, Ying C. Cheong, and Susan J. Bewley. “Influence of shift work on early reproductive outcomes: a systematic review and meta-analysis.” Obstetrics & Gynecology 124, no. 1 (2014): 99–110; Chung, Fen-Fang, Chuan-Chiang Chou Yao, and Gwo-Hwa Wan. “The associations between menstrual function and lifestyle/working conditions among nurses in Taiwan.” Journal of Occupational Health 47, no. 2 (2005): 149–156; Goldstein, Cathy A., and Yolanda R. Smith. “Sleep, Circadian Rhythms, and Fertility.” Current Sleep Medicine Reports 2, no. 4 (2016): 206–217; Lauria, Laura, Terri J. Ballard, Massimiliano Caldora, Clelia Mazzanti, and Arduino Verdecchia. “Reproductive disorders and pregnancy outcomes among female flight attendants.” Aviation, Space, and Environmental Medicine 77, no. 5 (2006): 533–539; Grajewski, Barbara, Elizabeth A. Whelan, Christina C. Lawson, Misty J. Hein, Martha A. Waters, Jeri L. Anderson, Leslie A. MacDonald et al. “Miscarriage among flight attendants.” Epidemiology 26, no. 2 (2015): 192–203.

3. Marino, Jennifer L., Victoria L. Holt, Chu Chen, and Scott Davis. “Shift Work, hCLOCK T3111C polymorphism, and endometriosis risk.” Epidemiology (2008): 477–484.

4. Watson, Nathaniel F., M. Safwan Badr, Gregory Belenky, Donald L. Bliwise, Orfeu M. Buxton, Daniel Buysse, David F. Dinges et al. “Joint consensus statement of the American Academy of Sleep Medicine and Sleep Research Society on the recommended amount of sleep for a healthy adult: methodology and discussion.” Journal of Clinical Sleep Medicine 11, no. 8 (2015): 931–952; Ford, Earl S., Timothy J. Cunningham, and Janet B. Croft. “Trends in self-reported sleep duration among US adults from 1985 to 2012.” Sleep 38, no. 5 (2015): 829–832.

5. Gradisar, Michael, Amy R. Wolfson, Allison G. Harvey, Lauren Hale, Russell Rosenberg, and Charles A. Czeisler. “The sleep and technology use of Americans: findings from the National Sleep Foundation’s 2011 Sleep in America poll.” Journal of Clinical Sleep Medicine 9, no. 12 (2013): 1291–1299.

6. Iyengar, Bhanu. “The melanocyte photosensory system in the human skin.” Springer Plus 1, no. 2 (2013): 1–18; Tsutsumi, Moe, Kazuyuki Ikeyama, Sumiko Denda, Jotaro Nakanishi, Shigeyoshi Fuziwara, Hirofumi Aoki, and Mitsuhiro Denda. “Expressions of rod and cone photoreceptor-like proteins in human epidermis.” Experimental Dermatology 18, no. 6 (2009): 567–570.

7. Graham, Charles, Mary R. Cook, Mary M. Gerkovich, and Antonio Sastre. “Examination of the Melatonin Hypothesis in Women Exposed at Night to EMF or Bright Light.” Environmental Health Perspectives (2001): 501–507; Bojkowski, C.J., M.E. Aldhous, J. English, C. Franey, A.L. Poulton, D.J. Skene, and J. Arendt. “Suppression of nocturnal plasma melatonin and 6-sulfatoxymelatonin by bright and dim light in man.” Hormone and Metabolic Research 19, no. 09 (1987): 437–440.

8. DeFelice, Joy, R. Kambic, and R. DeFelice. “Light elimination therapy for the treatment of infertility: A pilot study.” Paper presented at the Billings Ovulation Method of America Meeting, Spokane, WA (2002): 1–4; Lee Barron, Mary. “Light exposure, melatonin secretion, and menstrual cycle parameters: an integrative review.” Biological Research for Nursing 9, no. 1 (2007): 49–69; Gamble, K.L., D. Resuehr, and C.H. Johnson. “Shift work and circadian dysregulation of reproduction.” Frontiers in Endocrinology 4 (2013): 92.

9. Figueiro, M.G., and M.S. Rea. “The effects of red and blue lights on circadian variations in cortisol, alpha amylase, and melatonin.” International Journal of Endocrinology 2010 (2009): 829351–829351.

10. Gooley, Joshua J., Kyle Chamberlain, Kurt A. Smith, Sat Bir S. Khalsa, Shantha M.W. Rajaratnam, Eliza Van Reen, Jamie M. Zeitzer, Charles A. Czeisler, and Steven W. Lockley. “Exposure to room light before bedtime suppresses melatonin onset and shortens melatonin duration in humans.” The Journal of Clinical Endocrinology & Metabolism 96, no. 3 (2010): E463-E472.

11. Leproult, Rachel, Egidio F. Colecchia, Mireille L’Hermite-Balériaux, and Eve Van Cauter. “Transition from dim to bright light in the morning induces an immediate elevation of cortisol levels.” The Journal of Clinical Endocrinology & Metabolism 86, no. 1 (2001): 151–157; Scheer, F.A.J.L., and Ruud M. Buijs. “Light affects morning salivary cortisol in humans.” The Journal of Clinical Endocrinology & Metabolism 84 (1999): 3395–3398.

12. Danilenko, Konstantin V., and Elena A. Samoilova. “Stimulatory Effect of Morning Bright Light on Reproductive Hormones and Ovulation: Results of a Controlled Crossover Trial.” PLOS Clinical Trials 4, no. 2 (2007).

13. Burke, Tina M., Rachel R. Markwald, Andrew W. McHill, Evan D. Chinoy, Jesse A. Snider, Sara C. Bessman, Christopher M. Jung, John S. O’Neill, and Kenneth P. Wright. “Effects of caffeine on the human circadian clock in vivo and in vitro.” Science Translational Medicine 7, no. 305 (2015): 305ra146; Landolt, Hans-Peter, Esther Werth, Alexander A. Borbély, and Derk-Jan Dijk. “Caffeine intake (200 mg) in the morning affects human sleep and EEG power spectra at night.” Brain Research 675, no. 1 (1995): 67–74.

14. Drake, C., T. Roehrs, J. Shambroom, and T. Roth. “Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed.” Journal of Clinical Sleep Medicine 9, no. 11 (2013): 1195-1200.

15. Landolt, Hans-Peter, Esther Werth, Alexander A. Borbély, and Derk-Jan Dijk. “Caffeine intake (200 mg) in the morning affects human sleep and EEG power spectra at night.” Brain Research 675, no. 1 (1995): 67–74.

16. Lee, Bruce Y., Patrick J. LaRiccia, and Andrew B. Newberg. “Acupuncture in theory and practice part 1: theoretical basis and physiologic effects.” Hospital Physician 40, no. 4 (2004): 11-18.

17. Yang, Pei-Yu, Ka-Hou Ho, Hsi-Chung Chen, and Meng-Yueh Chien. “Exercise training improves sleep quality in middle-aged and older adults with sleep problems: a systematic review.” Journal of Physiotherapy 58, no. 3 (2012): 157–163; Reid, Kathryn J., Kelly Glazer Baron, Brandon Lu, Erik Naylor, Lisa Wolfe, and Phyllis C. Zee. “Aerobic exercise improves self-reported sleep and quality of life in older adults with insomnia.” Sleep Medicine 11, no. 9 (2010): 934–940; Youngstedt, Shawn D., and Christopher E. Kline. “Epidemiology of exercise and sleep.” Sleep and Biological Rhythms 4, no. 3 (2006): 215–221.

18. Myllymäki, Tero, Heikki Kyröläinen, Katri Savolainen, Laura Hokka, Riikka Jakonen, Tanja Juuti, Kaisu Martinmäki, Jukka Kaartinen, Marja-Liisa Kinnunen, and Heikki