Three grams of glycine taken before bed lowers your core body temperature from the inside. That drop is what lets your first block of slow-wave sleep run deep instead of shallow.

Glycine is an amino acid you already have. Taken as a supplement in the last hour, it does something specific and measurable.

It reaches the brain and widens the blood vessels in your hands and feet. Warm blood moves to the surface, heat leaves the body, and the core cools.

Tomorrow morning, make your coffee like you normally do.

Don’t change anything about the brewing. Don’t overthink it.

Just pause for a second.

Do this one very specific thing before you drink.

This is exactly the part researchers studying age-related memory changes have been paying attention to.

Not because coffee is the issue. You don’t have to give up that precious morning brew!

But because what happens in those first few seconds after routine actions may matter more than we used to think.

And there’s a very specific reason for that “pause step” that isn’t obvious at all.

>> See what THIS with your coffee can do for your memory

This is the same endpoint a warm bath reaches, arrived at through the bloodstream instead of the skin. Glycine acts on receptors in the hypothalamus, the region that sets your core temperature.

It signals for that distal warming, the vessels open, and the core setpoint drops. The lower your core runs at the start of the night, the faster you reach deep sleep and the longer you hold it.

That deeper first block is the part you feel in the morning. It is the difference between waking sharp and waking like you slept through your own recovery.

Glycine does not knock you out. It changes the quality of the sleep you were going to get anyway.

The anchor work comes from a team at Ajinomoto in Japan, published across a set of controlled trials around 2007. They gave three grams of glycine before bed to people who were mildly sleep-restricted.

The glycine group reached slow-wave sleep faster and reported less daytime fatigue and sharper thinking the next day. The measured drop in core temperature tracked the improvement in how deep the sleep ran.

Here is the move. Take three grams of glycine, plain powder stirred into a little water, about sixty minutes before you plan to fall asleep.

Three grams is the dose that was studied, not one and not five. It is slightly sweet on its own, so it needs nothing added.

If you take a warm bath some nights, glycine is the version for the nights you do not. Same core drop, different door in.

The last hour is not about sedation. It is about dropping your core temperature on time so the deepest stretch of your night starts deep instead of shallow.