In researching the relationship between sleep and weight, the scientific research below was particularly helpful in identifying a connection between poor sleep and weight gain.

Study 1: Short Sleep Duration Is Associated with Reduced Leptin, Elevated Ghrelin, and Increased Body Mass Index. [LINK] Authorship: Shahrad Taheri, Ling Lin, Diane Austin, Terry Young, and Emmanuel Mignot, © 2004 Taheri et al., pursuant to a Creative Commons License.

Study 2: Relationship of Ghrelin and Leptin Hormones With Body Mass Index and Waist Circumference in a Random Sample of Adults. [LINK] Authorship: Monti V, Carlson JJ, Hunt SC, Adams TD.

Study 3: Short Sleep Duration and Weight Gain: a Systematic Review. [LINK]
Authorship: Sanjay R. Patel and Frank B. Hu.