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3:14 a.m. Heart rate 92. Sweating. Shivering. Wide awake. This was every night for 12 years. I tried magnesium glycinate. L-threonate. Taurate (made me wired). Melatonin 0.3mg up to 10mg. Ashwagandha. Calm. Headspace. HRT. Trazodone (hungover until 2pm). Therapy. A sleep study that found nothing. None of it touched the 3am wake-ups. A Stanford neurologist finally explained why. Perimenopause attacks the vagus nerve. The off-switch your body uses to flip out of sympathetic stops firing on time. The handoff to parasympathetic fails. You wake up wired. It's autonomic, not hormonal. That's why nothing in the supplement aisle reaches it. A 20-minute clinical protocol exists now. The Cleveland Clinic uses it. JAMA published the trial in 2024. We built the first consumer device to that protocol. 60-night home trial. Read what 312 women in our cohort kept →