“…It did not, however, report on specific effects (positive or negative) on breathing during sleep, and this should theoretically be considered, particularly as methysergide has been experimentally shown to abolish hypoglossal atonia seen during carbichol-induced, REM-like sleep (28), without affecting REM sleep generation in animal models (29). Methysergide and pizotifen also have differential effects on the circadian secretion profiles of both growth hormone and prolactin, with methysergide attenuating the nocturnal surge in prolactin and increasing the amplitude of growth hormone secretion, whereas pizotifen has no effect (30). No studies have examined their effects on melatonin physiology.…”