There’s a very good reason why new parents report feeling more exhausted in the morning than when they went to bed the night before. In the first study of its kind, Prof. Avi Sadeh and a team of researchers from Tel Aviv University’s School of Psychological Sciences explain why interrupted sleep can be as physically detrimental as no sleep at all.
In the study, published in the journal Sleep Medicine, the Israeli researchers discovered that interrupted sleep is equivalent to no more than four consecutive hours of sleep.
Prof. Sadeh and his colleagues Michal Kahn, Shimrit Fridenson, Reut Lerer, and Yair Ben-Haim established a causal link between interrupted sleep patterns and compromised cognitive abilities, shortened attention spans, and negative moods.
“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 Prof. 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.”
Prof. Sadeh, who directs a sleep clinic at TAU, 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,” he said.
The study also showed why parents may feel anger toward their children.
“Our study shows the impact of only one disrupted night,” said Prof. 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. Besides the physical effects of interrupted sleep, parents often develop feelings of anger toward their infants and then feel guilty about these negative feelings.
“Sleep research has focused in the last 50 years on sleep deprivation, and practically ignored the impact of night-wakings, which is a pervasive phenomenon for people from many walks of life. I hope that our study will bring this to the attention of scientists and clinicians, who should recognize the price paid by individuals who have to endure frequent night-wakings.”