All articles
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 by age: normal ranges by decade, why it declines, and how to read yours
HRV
Cortisol and libido: how stress puts desire on ice in your 40s
Libido & desire
Hormones and sleep in midlife: estrogen, progesterone, cortisol, and testosterone
Testosterone
Postpartum recovery timeline after 35: what to expect, month by month
Menstrual Cycle
Is erectile dysfunction a sign of heart disease? What your sex life can tell you about your heart
Erectile function
Responsive desire: why desire changes in long relationships — and how to work with it
Libido & desire
Testosterone after 40: the real decline, the "low t" myths, and what actually helps
Testosterone
Sex drive by age: how libido changes for women and men, decade by decade
Libido & desire
Low libido in women: why your sex drive is low and what actually helps
Libido & desire