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Why you wake up anxious: the morning cortisol surge, poor sleep, and how to calm it
Cortisol
August 2, 2026
Does nicotine raise your heart rate? What vaping does to your pulse, HRV, and sleep
Nicotine
August 2, 2026
Stress eating: why cortisol drives you to sugar and fat — and how to break the loop without willpower
Weight & Metabolism
August 2, 2026
Sexual performance anxiety: why stress shuts down arousal — and what actually helps
Erectile function
August 2, 2026
Loneliness and your nervous system: why disconnection shows up in your sleep, stress, and HRV
Grief & loss
August 2, 2026
Hangxiety: why you feel anxious the day after drinking — and what your heart rate reveals
Alcohol
August 2, 2026
Grief and the body: how loss raises your heart rate, breaks your sleep, and why "broken heart" is literal
Grief & loss
August 2, 2026
Doomscrolling before bed: what your phone really does to your sleep — light, a wired brain, and stolen hours
Insomnia
August 2, 2026
Your body remembers stress: why you can't just "relax" — and how to retrain the off switch
Stress
August 2, 2026
Cannabis and sleep: why it helps you fall asleep but can steal your REM and recovery
Cannabis
August 2, 2026
How long does caffeine really last? What 200 mg does to your heart rate and sleep
Caffeine
August 2, 2026
How many days does your body really need to recover from one night of drinking?
Alcohol
August 2, 2026
What alcohol does to your body overnight: the HRV crash, higher resting heart rate, and lost REM you can see the next morning
Alcohol
August 2, 2026
Why breakups hurt so much — the brain science of heartbreak, and how to help yourself heal
Grief & loss
August 1, 2026
Weather and your body: what science says about weather sensitivity
Migraine
August 1, 2026
Your body across the menstrual cycle: how resting heart rate, HRV, temperature, sleep, and energy shift from day 1 to day 28
Menstrual Cycle
August 1, 2026
The REM sleep you're losing after 40 — why deep, dreaming sleep fades, and what it costs
Sleep quality
August 1, 2026
Is it stress or perimenopause? How to tell them apart — and what your HRV and sleep can (and can't) show
Menstrual Cycle
August 1, 2026
HRV declines with age — here's how to read your recovery dashboard in midlife
HRV
August 1, 2026
Cortisol and "frozen" libido in your 40s: how chronic stress puts desire on ice
Libido & desire
August 1, 2026