12/08/2026
Comment LABS and I’ll show you I’m right.
Poor sleep. Anxiety. Heavy periods. Brain fog. They can share one root cause: declining progesterone.
Progesterone isn’t just about your cycle - it’s your calming hormone, helping you sleep and feel settled. It also balances oestrogen’s effect on your uterine lining, which is part of why periods can get heavier as it drops.
For most women, this decline starts in the mid-to-late 30s - years before your period looks any different. Still bleeding doesn’t mean you’re still ovulating, and ovulation is how your body makes progesterone.
This isn’t about self-diagnosing. It’s about seeing one conversation instead of four. And maybe why HRT should start with just progesterone in your 40s, when estrogen is usually already high 😉