Interrupted Sleep Can Be As Harmful As No Sleep

New parents often have a low quality of life as they tend to necessities such as a feeding, a diaper change, or just a fussy baby, for every hour on the hour.

Parents often report feeling more exhausted in the morning than when they went to bed the night before.

A new study, published in the journal Sleep Medicine, explains why interrupted sleep can be as physically detrimental as no sleep at all.

In the research Avi Sadeh, Ph.D., and a team of researchers from Tel Aviv University (TAU) establish a causal link between interrupted sleep patterns and compromised cognitive abilities, shortened attention spans, and negative moods.

The researchers discovered that interrupted sleep is equivalent to no more than four consecutive hours of sleep.

“The sleep of many parents is often disrupted by external sources such as a crying baby demanding care during the night.

Doctors on call, who may receive several phone calls a night, also experience disruptions,” said Sadeh.

“These night wakings could be relatively short — only five to ten minutes — but they disrupt the natural sleep rhythm. The impact of such night wakings on an individual’s daytime alertness, mood, and cognitive abilities had never been studied.

Our study is the first to demonstrate seriously deleterious cognitive and emotional effects.”

“In the process of advising these parents, it struck me that the role of multiple night wakings had never been systematically assessed,” said Sadeh, who directs a sleep clinic at TAU, where he advises exhausted and desperate parents on how to cope with their children’s persistent night wakings.

“Many previous studies had shown an association, but none had established a causal link. Our study demonstrates that induced night wakings, in otherwise normal individuals, clearly lead to compromised attention and negative mood.”

The study was conducted on student volunteers at TAU’s School of Psychological Sciences.

Their sleep patterns were monitored at home using wristwatch-like devices that detected when they were asleep and when they were awake.

The students slept a normal eight-hour night, then experienced a night in which they were awakened four times by phone calls and told to complete a short computer task before going back to sleep after 10-15 minutes of wakefulness.

The students were asked each following morning to complete certain computer tasks to assess alertness and attention, as well as to fill out questionnaires to determine their mood.

The experiment showed a direct link between compromised attention, negative mood, and disrupted sleep — after only one night of frequent interruptions.

“Our study shows the impact of only one disrupted night,”  Sadeh.

“But we know that these effects accumulate and therefore the functional price new parents — who awaken three to ten times a night for months on end — pay for common infant sleep disturbance is enormous.”

Investigators explain that for the last 50 years, a majority of sleep research has focused on sleep deprivation, and practically ignored the impact of night-wakings, a pervasive phenomenon for people from many walks of life.

Besides the physical effects of interrupted sleep, parents often develop feelings of anger toward their infants and then feel guilty about these negative feelings.

Sadeh believes the new study will help scientists and clinicians recognize the price paid by individuals who have to endure frequent night-wakings. His new research involves evaluating interventions for infant sleep disturbances that may reduce the detrimental effects of disrupted sleep on parents.

Source: American Friends of Tel Aviv University

Tired mother holding her baby photo by shutterstock.