All articles
Cannabis and sleep: why it helps you fall asleep but can steal your REM and recovery
Cannabis
How long does caffeine really last? What 200 mg does to your heart rate and sleep
Caffeine
How many days does your body really need to recover from one night of drinking?
Alcohol
What alcohol does to your body overnight: the HRV crash, higher resting heart rate, and lost REM you can see the next morning
Alcohol
Why breakups hurt so much — the brain science of heartbreak, and how to help yourself heal
Grief & loss
Your body across the menstrual cycle: how resting heart rate, HRV, temperature, sleep, and energy shift from day 1 to day 28
Menstrual Cycle
The REM sleep you're losing after 40 — why deep, dreaming sleep fades, and what it costs
Sleep quality
Is it stress or perimenopause? How to tell them apart — and what your HRV and sleep can (and can't) show
Menstrual Cycle
HRV declines with age — here's how to read your recovery dashboard in midlife
HRV
Cortisol and "frozen" libido in your 40s: how chronic stress puts desire on ice
Libido & desire
How sleep runs your hormones in midlife: testosterone, estrogen, and cortisol
Testosterone
Postpartum recovery after 35: what sleep, stress, and HRV have to do with bouncing back
Menstrual Cycle