The research has been published in the 'JAMA Network Open Journal'. "The students got about 75 minutes more sleep per day during the lockdown. At the same time, their health-related quality of life improved significantly and their consumption of alcohol and caffeine went down," said the study's co-leader Oskar Jenni, UZH professor of developmental pediatrics. Because they no longer had to travel to school, they were able to get up later.
The researchers conducted an online survey with 3,664 high school students in the Canton of Zurich during the lockdown, asking about their sleep patterns and quality of life. They then compared the answers with a survey from 2017 with 5,308 young participants.
The results showed that during the three months in which the schools were closed, the adolescents got up around 90 minutes later on school days, but went to bed only 15 minutes later on average - meaning their total amount of sleep increased by about 75 minutes a day. On weekends, there was little difference in the sleep times of the two groups
The students in the lockdown group rated their health-related quality of life higher, and the amount of alcohol and caffeine they reported consuming was less than the pre-pandemic group. "Although the lockdown clearly led to worse health and well-being for many young people, our findings reveal an upside of the school closures which has received little attention until now," said Jenni. Sleep deficits in adolescents can lead to general tiredness, anxiety, and physical ailments.
These in turn have a detrimental effect on cognitive functions such as concentration, memory, and attention, making it significantly harder to function in everyday life. The early start of the school day in Switzerland conflicted with the natural, biologically determined sleeping habits of teenagers. Because they had to get up early for school, many young people, therefore, suffered from chronic lack of sleep.
The topic has recently made its way onto the political agenda in several cantons across the country.
"Our findings clearly indicate the benefit of starting school later in the morning so that youngsters can get more sleep," said Jenni. He speculated that the positive effects on health and health-related quality of life would have been even greater had there not also been the negative effects of the pandemic on mental health.