While you sleep you fast for eight hours. For your muscles, that is a long stretch with nothing coming in.

This was the tenth issue this newsletter ever ran. It is worth another look, because overnight repair is the one most people feed wrong or not at all.

Your muscle tissue is always turning over, broken down and rebuilt. Rebuilding needs a supply of amino acids in the blood.

Through the night, with no food, that supply runs low. Breakdown outpaces repair, and the balance tips the wrong way. A slow protein before bed changes that. It releases amino acids gradually for hours, keeping the supply up while you are out.

The protein for this is casein. Casein is the slow-digesting protein in milk, and it forms a soft gel in the stomach that empties slowly.

Whey, the other milk protein, is fast. It spikes your amino acids and is gone before the night is half over.

Casein drips its amino acids out across the hours instead. That steady trickle is what keeps overnight repair supplied.

The forgetting in question is the everyday kind: where you left your keys, and the bigger things, like names, faces and dates.

Memory researchers at the University of New Mexico recommend you stop one everyday kitchen habit.

One small change. According to the researchers, it can strengthen your memory and sharpen your focus, starting today. Over 47,000 people have already made this simple change.

==> See the kitchen habit to drop

The payoff is recovery. If you train, or walk, or carry a body through a demanding day, this is the window your tissue rebuilds in.

Over months it also guards against the slow muscle loss that comes with age. That loss speeds up for women after midlife, which makes the overnight window worth using.

The anchor is a study by Res and colleagues in Medicine and Science in Sports and Exercise. Men who took casein before bed showed higher overnight muscle protein synthesis than those given a placebo.

Note the sample was young men. The mechanism should extend more broadly, but the direct evidence in women and older adults is thinner, so treat the size of the effect as less settled for you.

Here is the move. Take thirty to forty grams of casein in the last hour, from food or a casein supplement.

A bowl of cottage cheese or Greek yogurt is the simplest source, and both are casein-rich. Choose a lower-fat version if you are prone to reflux, and eat it as a bowl, not a gulped shake.

This is a protein dose, not a sugar snack, so it will not spike your glucose. It feeds the repair and leaves the night level.

The eight hours ahead are when your body rebuilds. Give it the slow protein to rebuild with, and you wake recovered, not just rested.