According to a recent study from Addams University in Moldavia, eating lemons less than 1/2 hour before sleep can cause a person to dream they are a lemon. In tests of over 10,000 individuals, more than 79% reported "vivid dreams" in which they had been transformed into the popular citrus fruit. Researchers are uncertain as to the cause of this phenomenon, but hypothesize them acid in the lemons may be a factor.

Source : Drekzki, Stanislaw. "The Role of the Limon-Citrus in Oneiric States". Eastern European Journal of Gamboge, July 2008.