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90-30 nap formula can put off drowsiness and fatigue in night shift workers: Study

The study has analysed the data of pilot studies on night-shift naps conducted from 2012 to 2018.

Kristina Das Edited By: Kristina Das New Delhi Published on: September 16, 2023 17:16 IST
90-30 nap formula
Image Source : FREEPIK A study has found that a 90-30 nap formula can put off drowsiness and fatigue in night shift workers.

The '90-30 nap formula' is an effective way to help night shift workers reduce feelings of drowsiness and fatigue. It involves taking a 90-minute nap just before the start of the shift, followed by a 30-minute nap every four hours during the shift. By breaking up sleep into smaller chunks, the body is able to recuperate more efficiently and stay alert throughout the night shift. Studies have shown that this technique improves alertness and reaction times, as well as reducing fatigue-related errors. It can also help improve overall health by ensuring that shift workers are getting enough quality sleep.?

According to a new study published in the Journal Scientific Reports, a 90-minute nap followed by a 30-minute nap is more effective in putting off drowsiness and fatigue than a single 120-minute nap during overnight duty. It has analysed the data of pilot studies on night-shift naps conducted from 2012 to 2018.

“A 90-minute nap to maintain long-term performance and a 30-minute nap to maintain lower fatigue levels and fast reactions, as a strategic combination of naps, can be valuable for early morning work efficiency and safety,” said study sole author Sanae Oriyama, a nursing science professor at Hiroshima University’s Graduate School of Biomedical and Health Sciences.

Oriyama reexamined past pilot studies to compare alertness and performance after taking a nap and throughout a simulated 4 p.m. to 9 a.m. shift. And found that a single 120-minute nap ending at midnight experienced worse drowsiness.

However, two naps -- the 90-minute one lasting until midnight and the 30-minute one ending at 3 a.m. -- staved off drowsiness.

“I want to be able to combine multiple naps, depending on the type of work and time of day, and choose naps that are effective at reducing drowsiness, fatigue, and maintaining performance,” Oriyama said.

“During a night shift that, for example, lasts from 4 p.m. to 9 a.m. the next morning, a split nap of 90 minutes and 30 minutes, ending at 12 a.m. and 3 a.m., respectively, is thought to be more effective than a 120-minute monophasic nap ending at 12 a.m.,” she explained.

Interestingly, people who took longer to fall asleep during the 90-minute nap session showed poorer scores in the Uchida-Kraepelin test (UKT), a timed basic maths exam meant to measure speed and accuracy in performing a task.

Oriyama said the findings could also be helpful to new parents.

”The results of this study can be applied not only to night shift workers but also to minimise sleep deprivation fatigue in mothers raising infants,” Oriyama added.

(With IANS Inputs)

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