Sleep & 3AM Wakeups | The Longevity Vault

Will Your Sleep Go Back to Normal When You Stop Ozempic?

It depends on which type of sleep disruption you experienced. Drug-dependent effects — especially GI side effects and possible GLP-1-related arousal effects — would be expected to ease as semaglutide exposure declines over about five weeks. Dream changes are reported anecdotally, but PubMed-indexed evidence directly tying semaglutide to vivid dreams or nightmares is limited. Weight-dependent […]

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Why Does Inflammation Cause Insomnia?

Peripheral inflammation causes insomnia primarily through the vagus nerve. Inflammatory cytokines like TNF-alpha and IL-1-beta activate vagal sensory neurons that relay signals to the brainstem nucleus tractus solitarius within minutes — faster than blood-borne pathways. Animal vagotomy studies confirm this: severing the vagus nerve blocks inflammation-driven sleep changes at physiologically relevant doses. In humans, two

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What Supplements Have Evidence for Menopause Insomnia?

Sleep & 3AM Wakeups, Women's Hormones and Sleep / Kat Fu, M.S., M.S.

Magnesium has the strongest evidence base, with three randomized controlled trials showing reduced insomnia severity, increased sleep time, and improved deep and REM sleep in menopausal-age women. Ashwagandha has two RCTs — one in perimenopausal women — showing improved sleep quality via cortisol reduction. Valerian has one RCT in postmenopausal women and a second RCT

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

Autonomic Sleep, Sleep & 3AM Wakeups / Kat Fu, M.S., M.S.

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 / Kat Fu, M.S., M.S.

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

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Can Rotating Night Schedules Permanently Desynchronize Your Peripheral Clocks?

Circadian Sleep, Sleep & 3AM Wakeups / Kat Fu, M.S., M.S.

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

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

Metabolic Sleep, Sleep & 3AM Wakeups / Kat Fu, M.S., M.S.

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

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

Metabolic Sleep, Sleep & 3AM Wakeups / Kat Fu, M.S., M.S.

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

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

Metabolic Sleep, Sleep & 3AM Wakeups / Kat Fu, M.S., M.S.

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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How Long Does Menopause Insomnia Last?

Sleep & 3AM Wakeups, Women's Hormones and Sleep / Kat Fu, M.S., M.S.

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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