Sodium Timing on Keto: Why WHEN You Salt Matters More Than How Much

Most keto eaters I talk to who "already do electrolytes" are getting enough sodium in total — sometimes more than enough. They still wake up at 3am. The reason is almost always the same: they take their electrolyte stick in the morning, salt their eggs, and then eat nothing salty after 2pm. Total daily sodium looks fine. The 3am number doesn't.

The rule

Your body needs sodium available at 3am, not at 8am. The pre-dawn cortisol pulse triggers based on electrolyte status at that moment, not the 24-hour average. Front-loading sodium is like filling the gas tank in the morning and driving all day — by 3am the tank is empty.

The timing that works

1. Morning: ~500–1,000 mg (a normal salty breakfast, or half an electrolyte packet).
2. Midday: ~1,000 mg (salted lunch, broth, olives).
3. Dinner: ~1,500–2,000 mg. Salt aggressively. This is the meal that carries you through the night.
4. Bedtime pinch: ~250–500 mg in a small glass of water, with your magnesium glycinate. This is the piece almost nobody does, and it's the piece that stops the 3am wakeup.

Why the bedtime pinch works

A small dose of sodium at bedtime doesn't spike blood pressure or wake you up to pee (it's tiny). What it does is keep serum sodium stable through the second half of the night, which keeps the cortisol pulse quiet. Most readers who try only this — no other change — report better sleep by night two.

When to skip the bedtime dose

If you have diagnosed hypertension controlled with medication, or heart failure, talk to your doctor before adding evening sodium. For most healthy adults on keto, the bedtime pinch is a bigger sleep lever than any supplement in the cabinet.