Luke, David P, and Karolina Zychowicz. “Working the Graveyard Shift at the Witching Hour: Further Exploration of Dreams, Psi and Circadian Rhythms”. International Journal of Dream Research 7, no. 2 (October 27, 2014): 105–112. Accessed October 2, 2022. https://journals.ub.uni-heidelberg.de/index.php/IJoDR/article/view/12000.