615
Stuart Heritage, «I've Hit a Sleep Wall and I'm Seeing Double,» The Guardian, June 13, 2015, http://www.theguardian.com.
616
Pawlowski, «Does Mommy Brain Really Exist? Help for Sleep-Deprived Parents,» TODAY, November 11, 2014, .
617
Karp, email to the author.
618
Mika Brzezinski, All Things at Once (New York: Weinstein Books, 2009), Kindle edition.
619
Ibid.
620
Ibid.
621
Aimee Molloy, "Sleep Training At 8 Weeks: 'Do You Have the Guts?' " The New York Times, March 26, 2015, http://www.nytimes.com.
622
Zach Johnson, «Zoe Saldana Is Having a Hard Time Sleep Training Her Twins (Although Vodka Makes It a Little Easier) – Watch Now!» E! Online, June 12, 2015, .
