New research suggests that a disorder called "sleep drunkenness may affect one in seven people. Sleep drunkenness disorder involves confusion or inappropriate behavior, like answering the phone instead of turning off the alarm, during or after being awakened.
Neurologists say these episodes occur either during the first part of the night or in the morning and may even cause violent behavior during sleep or amnesia about what happened.
Fifteen percent of people in the study had an episode in the last year, with more than half reporting more than one episode a week. Most of those with sleep drunkenness also had a sleep disorder, a mental health disorder, or were taking psychotropic drugs, such as antidepressants.
The research is published in current issue of Neurology, the medical journal of the American Academy of Neurology.