August 28, 2014 in Nation/World

‘Sleep drunkenness’ more common than thought, study finds

Amina Khan Los Angeles Times
 
What happens

In confusional arousal, sleepers wake up in a disoriented state and perhaps behave strangely in the process. They may not even remember what happens during the episodes.

Ever heard of “sleep drunkenness”? If you’ve ever tried to reach for your phone when your alarm clock rings or been so disoriented when you wake up that you don’t know where you are, you may have experienced what’s known formally as “confusional arousal.”

More than 1 in 7 people in the U.S. may suffer from the condition, according to a study in the journal Neurology – which would make sleep drunkenness far more common than thought.

In confusional arousal, sleepers wake up in a disoriented state and perhaps behave strangely in the process. They may not even remember what happens during the episodes.

The condition often occurs when someone wakes up during non-REM sleep and can be triggered by a “forced awakening,” the study authors wrote. It can potentially cause violent behavior during sleep or right as the person wakes up.

Confusional arousals “have received considerably less attention than sleepwalking even though the consequences can be equally serious,” according to the study, led by Maurice Ohayon of Stanford University.

To find out how prevalent sleep drunkenness is, the researchers surveyed 19,136 people age 18 or older in 15 states. They found that 15.2 percent of respondents said they had experienced a confusional arousal episode in the previous year. A full 84 percent of those incidents were connected to sleep or mental disorders or psychotropic drugs. But the episodes were overwhelmingly linked to sleep disorders, which were present 70.8 percent of the time.

The majority of those who’d experienced confusional arousal were experiencing it regularly - 53.8 percent reported having at least one episode per week, and 24.7 percent reported two to five episodes per month.

For 37.6 percent of sufferers, the episodes were brief – less than 5 minutes. But 30.1 percent of them said the episodes could last 15 minutes or more after waking up.

Many shared similar symptoms: 57 percent reported being disoriented as they woke up, 34.4 percent said they had difficulty talking or thinking clearly, and 19.9 percent said they experienced “inappropriate behaviors” such as grabbing the phone instead of flailing for the alarm clock.

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