Schüssler, P., Uhr, M., Ising, M., Weikel, J. C., Schmid, D. A., Held, K., Mathias, S., & Steiger, A. (2006). Nocturnal ghrelin, ACTH, GH and cortisol secretion after steep deprivation in humans. Psychoneuroendocrinology, 31(8), 915-923.