[1] Steven P. Shelov, Tanya Remer Altmann, Robert E. Hannemann, et al. Caring for Your Baby and Young Child: Birth to Age 5[M], sixth edition. New york: Bantam Books Trade, 2015
[2] https://www.sleepfoundation.org/articles/how-your-babys-sleep-cycle-differs-your-own
[3] https://www.healthychildren.org/English/ages-stages/baby/sleep/Pages/Back-to-Sleep-Tummy-to-Play.aspx
[4]https://www.urmc.rochester.edu/encyclopedia/content.aspx?contenttypeid=90&contentid=P02632
[5] Yates J. The long-term effects of light exposure on establishment of newborn circadian rhythm. J Clin Sleep Med. 2018;14(10):1829–1830.
[6]https://www.urmc.rochester.edu/encyclopedia/content.aspx?contenttypeid=90&contentid=P02632