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

Cardiovascular & Cancer

Matthew Walker highlights the severe cardiovascular consequences of sleep deprivation. He explains that even one night of reduced sleep can spike blood pressure and cortisol levels, putting the body in a constant state of fight or flight 1. Chronic sleep deprivation, he argues, is akin to revving a car engine in neutral, leading to inevitable mechanical failure.

It's not surprising that just revving the daylights out of that engine, at some point, gaskets are going to start blowing.

--- Matthew Walker

Walker also discusses the link between sleep loss and cancer, citing a study where sleep-deprived mice developed tumors that were 200% larger than those in well-rested mice 2. This underscores the critical role of sleep in immune function and cancer prevention.

   

Sleep Deprivation

Walker emphasizes that humans are unique in deliberately depriving themselves of sleep, unlike other species that only do so under extreme conditions like caring for young or starvation 3. This chronic sleep deprivation has far-reaching consequences, including an increased risk of Alzheimer's disease.

There seems to be an interaction, a gene by cardiovascular disease interaction that leads that genotype to predispose you to Alzheimer's disease.

--- Matthew Walker

He explains that insufficient sleep can exacerbate genetic predispositions to Alzheimer's, particularly through mechanisms involving the sympathetic nervous system and cortisol levels 4.

   

Social Impact

The concept of 'social jet lag' is another critical issue Walker addresses. He describes it as a cycle of sleep deprivation during the week followed by binge sleeping on weekends, which wreaks havoc on our circadian rhythms 5. This pattern is akin to constantly flying between time zones, leading to long-term health problems.

It's this real binge purge kind of abstinence syndrome.

--- Matthew Walker

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