AMA #16: Sleep, Vertigo, TBI, OCD, Tips for Travelers, Gut-Brain Axis & More

Recorded live from Sydney during an Australia tour, this AMA covers a wide range of listener questions on health and neuroscience. Huberman discusses maintaining health pillars while traveling, how to interpret five-to-six hours of sleep using his QQRT framework, and the mechanics of vertigo via the vestibulo-ocular reflex. He addresses recovering brain function after poor sleep, diet and TBI, emphasizing the body's robustness, glymphatic clearance, creatine and hyperbaric treatment. Further answers cover the basal-ganglia basis of OCD, circadian shifting for travel using temperature minimum, fish oil dosing for EPA, hormone testing schedules, gut-brain axis, and tongue cleaning.

• Huberman frames sleep around QQRT (quality, quantity, regularity, timing), an acronym from Matt Walker, author of Why We Sleep.
  00:08:26
• He cites Alia Crum's Stanford lab showing a poor sleep score hurts performance and a good score maintains or enhances it, even when actual sleep contradicts the score.
  00:09:59
• He explains vertigo via otoliths in three hula-hoop-shaped inner-ear canals and the vestibulo-ocular reflex mediated by the cerebellum.
  00:16:51
• His vertigo fix: fixate on a distant point and walk toward it, or move a finger toward your nose, forcing the visual component to override faulty inner-ear error signals.
  00:18:28
• He recommends 5 to 10 grams of creatine monohydrate daily to enhance creatine phosphate metabolism in the forebrain under TBI or high-altitude conditions.
  00:25:15
• He describes OCD as basal-ganglia miswiring where the compulsion exacerbates rather than relieves the obsession, treated by pairing neuroplasticity-opening drugs with resistance behaviors.
  00:27:23
• He advises 1 to 3 grams of EPA-form omega-3 daily for a mild-to-moderate antidepressant effect, noting high-concentration EPA is a prescription drug.
  00:38:15
• For a three-hour westward shift he gives a temperature-minimum protocol: get bright light a couple hours before normal wake time on the two days before traveling.
  00:30:59

• Huberman travels with a small red light bulb unit to lower evening cortisol and ease sleep, noting even red party lights work.
  00:03:41
• Sleeping with feet elevated 5 to 15 degrees increases glymphatic flow, while falling asleep upright in a chair is the worst for it.
  00:24:43
• High-dose curcumin/turmeric can limit dihydrotestosterone production, and many turmeric sources have shown lead contamination.
  00:24:43
• Omega-3 fatty acids provide the substrate for the lipid bilayer surrounding neurons; humans rarely get enough unless eating krill or fatty fish.
  00:38:49
• Hormone interpretation hinges on ratios; total testosterone of 900 with free testosterone of 2 signals a problem, while 500-600 total with free of 15 is healthy.
  00:42:29
• Justin Sonnenburg lets his kids eat without washing hands after outdoor play to diversify their gut microbiome, and owning a pet also increases microbiome diversity.
  00:50:44
• Dentists advise gentle tongue brushing with a separate soft toothbrush from the one used on teeth, and baking soda ranks low on the enamel abrasion scale.
  00:53:22
• Streptococcus mutans, a mouth bacterium that proliferates after sugary foods, can cross the blood-brain barrier and is thought a possible contributor to dementia.
  00:54:58