Fifty-seven percent of adults usually don't get up with the first wake-up call, but stay in bed until the second or third ring, a new study by somnologists at Indiana University of Notre Dame has found.   According to an article in the journal Sleep, alarm bells can theoretically interrupt sleep cycles, making it difficult to wake up. Because of this, people half-asleep press the snooze button to repeat the alarm, but turning off the bell for a few more minutes simply moves the body into the next sleep cycle, which is then interrupted again. There are few reliable studies on the effects of a delayed alarm clock on sleep, and most of them are extrapolated from studies of sleep or stress-related behavior. So researchers at the University of Notre Dame surveyed 450 adults about their sleep, and they were also given an activity tracker. As a result, repeating the alarm clock was associated with fewer steps during the day and sleep disturbances. Also, "owls" were more likely to use the repeat button and reported more fatigue overall. Researchers also found that women were 50 percent more likely to doze off after postponing the alarm bell than men; young people were also more likely to doze off after the first alarm clock than other age groups. Researchers believe this is due to people not getting enough sleep. They also noted that the forced awakening has a negative effect on a person's condition. In the future, the authors plan to conduct a study with a larger sample of respondents.