"Caffeine reduces time-of-day effects on memory performance in older adults," by Lee Ryan, Colleen Hatfield, and Melissa Hofstetter (Psychological Science, January 2002, Volume 13, Number 1, pp. 68-71).
"Optimal time of day and the magnitude of age differences in memory," by Cynthia May, Lynn Hasher, and Ellen Stoltzfus (Psychological Science, September 1993, Volume 4, Number 5, pp. 326-330).
The National Institute On Alcohol Abuse and Alcoholism:
www.niaaa.nih.gov. See "Pamphlets/Brochures/Fact Sheets/Posters" under "Publications."