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FRIDAY, June 1 (HealthDay News) -- After uncovering the secret lives of people who walk, eat and become aggressive while asleep, scientists are now turning to another bedtime phenomenon: "sleepsex."
Reports of sexual behavior while asleep have become so common that experts on Friday released a classification system that allows doctors to better document these cases.
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People who engage in sleepsex "don't remember what they do, and it's their bed partners who tell them. They're mortified, and the partner complains they're being assaulted or molested," said Dr. Carlos Schenck, a sleep researcher who was lead author on the report. "Now they'll realize this is a sleep-related disorder."
Since the 1990s, researchers have been exploring the range of "parasomnia" behaviors in which people do things other than sleep while sleeping.
Sleepwalking, of course, is nothing new -- ask Lady Macbeth -- but researchers are discovering that people eat while asleep, engage in violence, and even intensely scratch themselves.
"Anything that people do during the daytime, we're realizing they can do during sleep, all the instinctual or basic behaviors," Schenck, an associate professor of psychiatry at the University of Minnesota Medical School, said.
Schenck and colleagues explored existing reports of sexual behavior during sleep and created the classification system. Their work appears in the June issue of the journal Sleep.
The researchers looked at 31 cases of sleep-related sexual behavior. They found that 80 percent involved men. Only males engaged in sleep sexual intercourse (42 percent of cases) while females were more likely to engage in "sexual vocalizations." People of both genders reported incidents of sleep masturbation.
In one case, they reported, "a 28-year-old woman had nightly sexual moaning and sexual fondling during sleep for 16 years that would appear within 20 minutes of falling asleep and disturb the sleep of her husband and children."
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