Perimenopause doesn't just affect your hormones — it rewires your autonomic nervous system. Declining estrogen weakens the parasympathetic "brake" on your fight-or-flight response, leaving sympathetic activity elevated. Research links this shift to heart palpitations, poor sleep, anxiety, and the constant sense of being on edge. Cathy explains the science of perimenopause nervous system dysregulation and shares what the evidence actually supports for restoring balance.

Perimenopause temperature dysregulation goes far beyond hot flashes. When estrogen fluctuates, KNDy neurons in the hypothalamus become overactive — collapsing the thermoneutral zone and triggering inappropriate heating and cooling responses. Cold flashes, sudden chills, and unpredictable temperature swings are real, documented vasomotor symptoms. Cathy breaks down the neuroscience and what the evidence actually supports for fixing it.

The things that used to roll off you don't anymore. You are not weaker. Your stress regulation system has been neurobiologically reconfigured by perimenopause. The Swiss Perimenopause Study confirms cortisol rises during the transition — at the exact moment the sex hormones that buffer and modulate it decline. The HPA axis fires at lower thresholds. Recovery takes longer. The overnight cortisol nadir is disrupted. Here is the science of what changed — and the specific toolkit