#48–Matt Walker, Ph.D., on Sleep (Part 2 of 3): Heart disease, cancer, causes of sleep disruption...

School Times

Early school start times have significant repercussions on teenagers' sleep and academic performance. Matthew Walker explains that teenagers naturally need about nine to ten hours of sleep, but early start times force them to wake up before their bodies are ready, leading to chronic sleep debt 1. This sleep deprivation not only affects their ability to absorb information but also has broader societal impacts, such as increased juvenile crime during unsupervised hours 2.

We will look back in probably 20 years with shame that we were having schools start at 7:30 in the morning.

--- Matthew Walker

Walker suggests that starting school later could improve grades, reduce behavioral issues, and even decrease car accidents among teenagers 3.

   

Tech Impact

Modern technology significantly disrupts teenagers' sleep patterns, primarily through the use of screens and social media. Matthew Walker highlights that devices like iPads and smartphones emit blue light, which suppresses melatonin production, delaying sleep onset and reducing sleep quality 4. Additionally, the habit of checking devices during the night leads to sleep fragmentation and anticipatory anxiety, further diminishing sleep quality 5.

80% of teenagers admit to waking up during the night to check their phones and social media.

--- Matthew Walker

To combat these issues, Walker recommends limiting technology use before bed and removing devices from the bedroom to improve sleep hygiene 6.

   

Parental Tips

Parents play a crucial role in shaping their teenagers' sleep habits by managing technology use and creating a conducive sleep environment. Matthew Walker advises parents to limit light exposure after sundown, as excessive light can disrupt melatonin production, essential for sleep timing 7. He suggests using warm, yellow lighting instead of blue-enriched LED lights to minimize melatonin suppression 8.

We are a dark deprived society in this modern era and we need darkness at night to allow the release of a hormone called melatonin.

--- Matthew Walker

Additionally, Walker emphasizes the benefits of meditation for reducing stress and promoting better sleep, particularly in overcoming insomnia 9.