Tests, Fixes, and Ideas That Are Shaping My Longevity Strategy

Do Your Mitochondria Control When You Sleep? and Why Does It Break Down After 40?

Metabolic Sleep, Sleep & 3AM Wakeups /

Mitochondria generate the molecular pressure that makes you sleepy. A 2025 Nature study found that mitochondrial fragmentation and ATP accumulation in sleep-control neurons directly drive sleep onset — and that manipulating mitochondrial shape bidirectionally controls sleep duration. After 40, mitochondrial DNA copy number reductions, antioxidant defenses weaken, and the ROS (oxygen-derived molecules involved in redox […]

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Why Does Sleep Repair Your DNA — And Burn Through Your NAD+ to Do It?

Metabolic Sleep, Sleep & 3AM Wakeups /

Sleep is when neurons repair DNA lesions that build up during wakefulness. The enzyme PARP1 detects DNA breaks, consumes NAD+ to initiate repair, and promotes sleep pressure to create the conditions repair requires. In zebrafish and mice, six hours of consolidated sleep reduced neuronal DNA lesions, and PARP1 inhibition reduced NREM sleep by 33%. This

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Why Does Eastbound Jet Lag Last Longer Than Westbound — and What Determines Recovery Rate?

Circadian Sleep, Sleep & 3AM Wakeups /

Eastbound jet lag lasts roughly twice as long per time zone crossed as westbound. The reason is physiological: the human circadian period averages slightly longer than 24 hours, making day extension (westward) mechanically easier than day compression (eastward). A 2024 review of 23 studies confirmed the asymmetry — approximately 0.5 days per time zone westward,

Why Does Eastbound Jet Lag Last Longer Than Westbound — and What Determines Recovery Rate? Read Post »

Which Probiotic Strains Improve Sleep? What the Vagus Nerve Evidence Shows

Autonomic Sleep, Sleep & 3AM Wakeups /

Four probiotic strains have human trial evidence for sleep: Bifidobacterium longum 1714 (improved sleep duration during stress), Lactobacillus gasseri CP2305 (shortened sleep latency), Lactobacillus helveticus R0052 + B. longum R0175 (reduced cortisol), and NVP-1704 (improved Insomnia Severity Index in an 8-week RCT). A 2024 multi-strain RCT improved PSQI scores. A 2025 meta-analysis found probiotics reduced

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Do Antidepressants Suppress Rapid Eye Movement Sleep? What SSRIs, SNRIs, and Tricyclics Do to Sleep Architecture

Autonomic Sleep, Sleep & 3AM Wakeups /

Serotonergic antidepressants suppress REM sleep. SSRIs and SNRIs increase serotonin concentration in brainstem REM-generating circuits, which delays REM onset and reduces total REM duration in polysomnography studies. Tricyclics produce a similar effect through combined serotonergic and anticholinergic mechanisms. A 2017 review found that nearly all serotonergic antidepressants reduced REM sleep percentage, with the notable exceptions

Do Antidepressants Suppress Rapid Eye Movement Sleep? What SSRIs, SNRIs, and Tricyclics Do to Sleep Architecture Read Post »

How Long Does Menopause Insomnia Last?

Sleep & 3AM Wakeups, Women's Hormones and Sleep /

For many women, years. Sleep disturbance prevalence is 16-42% before menopause, 39-47% during perimenopause, and 35-60% after menopause. Perimenopause itself lasts 4-8 years. A 22-year longitudinal study identified four distinct insomnia trajectories: some women improve after the transition, some remain stable, and approximately one in five experience persistently high insomnia that does not resolve. Sleep

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Ozempic Nausea and Sleep: How Stomach Side Effects Keep You Awake at Night

Metabolic Sleep, Sleep & 3AM Wakeups /

Semaglutide delays gastric emptying in a way that can leave more food in the stomach later after a meal. In one small trial of women with PCOS and obesity, semaglutide increased half-emptying time from 118 to 171 minutes, a roughly 45% increase. When you lie down to sleep, that retained gastric volume can make reflux

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Why Are You Exhausted But Can’t Sleep? Is It a Mitochondrial Energy Paradox?

Metabolic Sleep, Sleep & 3AM Wakeups /

When mitochondria cannot produce enough adenosine triphosphate, every cell in your body registers an energy deficit — yet the molecular stress that deficit generates actively prevents restorative sleep. Stressd mitochondria release ROS and trigger stress-response proteins like WASF3, which block oxidative phosphorylation and change cells toward inefficient glycolysis. The result is a self-reinforcing loop: you

Why Are You Exhausted But Can’t Sleep? Is It a Mitochondrial Energy Paradox? Read Post »

Does Your Body Divert Tryptophan From Melatonin to Make NAD+?

Metabolic Sleep, Sleep & 3AM Wakeups /

Yes. About 95% of the tryptophan you consume goes to the kynurenine pathway, which produces NAD+ and other metabolites. Only 1-2% reaches the serotonin-to-melatonin route. During inflammation, an enzyme called IDO (indoleamine 2,3-dioxygenase) diverts even more tryptophan away from melatonin production. Your body’s demand for NAD+ — especially during immune activation — reduces the raw

Does Your Body Divert Tryptophan From Melatonin to Make NAD+? Read Post »

Can Rotating Night Schedules Permanently Desynchronize Your Peripheral Clocks?

Circadian Sleep, Sleep & 3AM Wakeups /

Rotating night schedules desynchronize peripheral organ clocks from the brain’s master clock — but “permanently” is the wrong frame. The suprachiasmatic nucleus (SCN) resists re-entraining to a night schedule, holding its day orientation while peripheral clocks in blood, liver, and skin begin adapting on their own timetable. The result is internal desynchronization: organs running out

Can Rotating Night Schedules Permanently Desynchronize Your Peripheral Clocks? Read Post »

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