"Variables predicting the reported occurrence and frequency of nocturnal orgasms among women are reported. Undergraduate and graduate women (N = 245) from a large midwestern university volunteered to complete nine self-report scales and inventories. Thirty-seven percent of the sample reported they had experienced nocturnal orgasm, and 30% reported having had the experience in the past year. The predictors accounted for a statistically significant amount of variation in each of the dependent variables: 33% of "ever experienced nocturnal orgasm," 44% of "experienced nocturnal orgasm in the past year," and 27% in the case of "frequency of nocturnal orgasm in the past year." Positive attitudes toward and knowledge of nocturnal orgasms, sexual liberalism, and waking sexually excited from sleep (without experiencing orgasm) were the most important predictors of nocturnal orgasm experience. The reported incidence of nocturnal orgasms in this sample is higher than in comparative samples of previous studies."