73: Is Sleep the Missing Vital Sign? – How Poor Sleep Wrecks Hormones, Brain Health & Longevity with Dr. Christian Jenski

20 Nov 2025 · 33 min
Episode

20 Nov 2025 · 33 min

0:00

Podcast episode (hosts: Aaron Hartman, MD; guest: Dr. Christian Jenski) focused on why sleep is a vital sign and how poor sleep harms longevity, hormones, brain health, metabolism and immune function. Key points: the U.S. has a population-level sleep deficit (average adult ~6–6.2 hrs vs historical ~8.5–9 hrs); even a 1–2 hour deficit impairs cognitive/response time comparable to alcohol use and increases rates of accidents, heart attacks and strokes around time changes. Sleep stages matter (deep sleep front-loaded early, REM back-loaded later); consistent bed/wake times preserve restorative deep and REM sleep. Sleep apnea is underdiagnosed, can occur in slender/hypermobile people (hypermobility prevalence mentioned), and treatments include CPAP and oral appliances; one host reported an AHI ~4.5–5 and nadir SpO2 ~92% and began dreaming after using a dental oral appliance. Melatonin is produced in many tissues (GI tract levels much higher than blood), is antioxidant/immune-modulating, and has roles beyond sleep (GI protection, adjunctive use in inflammatory/COVID/post-concussive cases). Hormonal dysregulation (HPA axis, cortisol, perimenopause, progesterone/allopregnanolone effects) interacts bidirectionally with sleep. Episode closes promising a follow-up focused on actionable sleep interventions.

Questions this episode answers

September 29, 2025

Average adult sleeps about 6 to 6.2 hours per night (speakers cite roughly 5.5–6 hrs in some sources).

Apnea–hypopnea index (AHI) ~4.5–5; lowest SpO2 reported ~92%.

Around 8.5 to 9 hours per night (mid-1800s).

High-schoolers: average sleep ~6.5 hrs but need 8–10 hrs; children 6–12: average ~8.4 hrs but need 9–12 hrs.

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