Mysteries of
the Human Body.
Alexandria, VA: Time-Life, 1990. Print. (1)
"Sleep and Mood." Healthy Sleep.
N.p., 31 Dec. 2008. Web. 12 Sept. 2012.
< http://healthysleep.med.harvard.edu/need-sleep/whats-in-it-for-you/mood> (2).
Smith, Melinda, Lawrence Robinson, and Robert
Segal. "How Much Sleep Do You Need?" Sleep Cycles, Stages, & Lack of
Sleep. N.p., June 2012. Web. 13 Sept. 2012.
<http://www.helpguide.org/life/sleeping.htm>.(3)
the Human Body.
Alexandria, VA: Time-Life, 1990. Print. (1)
"Sleep and Mood." Healthy Sleep.
N.p., 31 Dec. 2008. Web. 12 Sept. 2012.
< http://healthysleep.med.harvard.edu/need-sleep/whats-in-it-for-you/mood> (2).
Smith, Melinda, Lawrence Robinson, and Robert
Segal. "How Much Sleep Do You Need?" Sleep Cycles, Stages, & Lack of
Sleep. N.p., June 2012. Web. 13 Sept. 2012.
<http://www.helpguide.org/life/sleeping.htm>.(3)