Cockroach Model Sheds Light on Sleep’s Essential Role in Pregnancy

Recent research from biologists at the University of Cincinnati reveals that cockroaches and humans share an unexpected similarity: the increased need for sleep during pregnancy. Through a study published in the Journal of Experimental Biology, scientists found that pregnant Pacific beetle-mimic cockroaches sleep more, and that the extended rest of the mother is essential for proper development of her offspring. 

The Pacific beetle-mimic cockroach, which lives in Hawaii and parts of Asia, is remarkable because, unlike most insects, it gives birth to live young and nourishes them over a three-month gestation in a broodsac. During this time, the mother provides the developing embryos with milk proteins. Joshua Benoit’s lab explored how sleep patterns change in these cockroaches during pregnancy, investigating the relationship between maternal rest and the well-being of the young.

According to study lead author Ronja Frigard, “What makes these insects truly special is the way that they use the milk protein to nourish their young during development, the same way people use a placenta. This is called true ‘viviparity,’ and only a few other insects such as tsetse flies reproduce this way.” The research demonstrated that disturbances in the mother cockroach’s sleep had clear negative consequences. Chronic disruption not only lengthened the gestation period but also interfered with the transcription of milk proteins, ultimately reducing the nourishment available to the embryos.

The importance of adequate rest is not immediate, as co-author Oluwaseun Ajayi explained. “A lot of us take adequate sleep for granted because we don’t usually experience an immediate adverse effect of sleep deprivation. The truth is the health consequences of not having enough sleep build up over time. I believe this study provides additional evidence of the importance of sleep and the need for us to prioritize it like we do other things.” These findings from cockroach biology may have broader relevance to humans, as many connections exist between sleep and pregnancy in people.

Frigard emphasized the value of using animal models for such investigations, stating, “There are many connections between pregnancy and sleep in humans, so we're excited to learn more about it in this model insect.”