A U.S. national survey included 2,095 people aged 14 and older; researchers studied orgasms during sleep and exercise. Participants reported whether either had ever happened to them; sleep orgasms were more common than exercise-related orgasms. These figures are based on self-reports and describe the experience of this particular sample; they do not explain why it happens. Because the sample included teenagers, the findings should not be applied mechanically to every age group.
If the experience leaves you curious, embarrassed, or with mixed feelings, all of those reactions are understandable. You do not need to turn it into a diagnosis or assume it says something definitive about you. If involuntary reactions cause pain or severe discomfort, or leave you worried, you can discuss them with a medical professional. Otherwise, an unusual bodily response does not take away your right to decide what it means to you — or not to look for a meaning at all.