*The following is excerpted from an online article posted on ScienceDaily.
Teenagers who prefer to stay up late and wake later in the morning are more likely to suffer from asthma and allergies compared to those who sleep and wake earlier, according to a study published in ERJ Open Research.
Asthma symptoms are known to be strongly linked to the body’s internal clock, but this is the first study to look at how individual sleep preferences influence asthma risk in teenagers.
Researchers say the study reinforces the importance of sleep timing for teenagers and opens up a new channel of research into how sleep affects teenagers’ respiratory health.
The study involved 1,684 adolescents living in West Bengal, India, aged 13 or 14 years, who were taking part in the Prevalence and Risk Factors of Asthma and Allergy-Related Diseases among Adolescents (PERFORMANCE) study.
Each participant was asked about any wheezing, asthma, or symptoms of allergic rhinitis, such as a runny nose and sneezing. They were asked a series of questions to judge whether they were ‘evening types’, ‘morning types’ or in between, such as what time of the evening or night they tend to feel tired, when they would choose to wake up, and how tired they feel first thing in the morning.
Researchers compared the teenagers’ symptoms with their sleep preferences, taking into account other factors that are known to affect asthma and allergies, such as where the participants live and whether their family members smoke.
They found that the chance of having asthma was around three times higher in teens who prefer to sleep later compared to those who preferred to sleep earlier. They also found the risk of suffering allergic rhinitis was twice as high in late-sleepers compared to early-sleepers.