27/05/2026
You go to bed exhausted. You fall asleep within minutes. Then at 3am, your eyes pop open and your brain is doing inventory of every problem you've ever had. Sound familiar?
This pattern is so common in perimenopause it's almost diagnostic. You're not bad at sleeping. Your hormones changed the rules of sleep.
The story starts with progesterone. Progesterone is your nervous system's brake pedal. It works on the same GABA receptors that calming medications target. It also suppresses cortisol overnight. When progesterone drops in your late 30s and 40s, often years before your cycle changes, you lose that brake. Sleep becomes lighter, more fragmented, and easier to disrupt.
Then comes blood sugar. As oestrogen drops, insulin sensitivity changes. If your dinner was light on protein, or you skipped a meal earlier in the day, your blood sugar can dip in the middle of the night. The body doesn't tolerate low blood sugar in sleep. It releases cortisol and adrenaline to push glucose back up. That adrenaline surge feels exactly like 3am anxiety: racing heart, sweating, eyes wide open, brain spinning.
Layer on a cortisol curve that's been dysregulated by chronic stress, alcohol and poor sleep itself, and the night wake-up becomes predictable. The fix isn't a sleep tracker or melatonin. The fix is upstream.
Start with how you eat through the day. Protein at every meal, around 30 grams per sitting. Don't skip breakfast. Don't go more than 4–5 hours without eating. At dinner, include a slow carb (kūmara, rice, oats) with your protein to stabilise overnight blood sugar. Magnesium glycinate before bed. Bright light in your eyes within an hour of waking , this anchors your cortisol rhythm and helps it drop at night. Walk after dinner to improve insulin sensitivity. And if you drink alcohol, this is the area where you'll see the most dramatic change when you cut it back.