Your body is supposed to cool from the inside the moment you lie down. If it does not, you never reach the deep sleep that actually repairs you.
Three grams of glycine forces the drop. You have tried magnesium and melatonin. Neither one touches core temperature.
Your core temperature has to fall by close to a degree across the night for the deepest slow-wave sleep to take hold. That fall is not automatic.
It happens when blood moves to the surface of your hands and feet and sheds heat into the room. Glycine widens those peripheral vessels.
It acts on NMDA receptors in the suprachiasmatic nucleus, the cluster of cells that runs your internal clock. The signal pulls warm blood outward and speeds the cooling.
Faster cooling means you reach slow-wave sleep sooner and hold it longer. That stage is when growth hormone is released and physical tissue is rebuilt. Skip the drop and you get the hours without the depth. You sleep. Nothing heals.
That is the morning you know well. The eight hours that left you foggy and stiff anyway.
In a trial published in Sleep and Biological Rhythms, people who took three grams of glycine before bed reached slow-wave sleep faster and rated their sleep as deeper. Polysomnography confirmed the change was measurable, not just a feeling.
The effect showed up on the first night. Not after a week of building it up.
The human trials here are small. The temperature mechanism was mapped most precisely in animal work, so hold the certainty there loosely.
What is consistent across the work is one thread. Glycine lowers core temperature. Lower temperature deepens the stage that repairs you.
TONIGHT
Take three grams of plain glycine powder dissolved in a little water, about thirty minutes before you plan to fall asleep. It is faintly sweet and dissolves clean.
Give it the thirty-minute head start so the cooling is underway before you are unconscious. Timing is the part people get wrong.
Not glycine bound into a magnesium compound. Plain glycine, on its own.
The degree your body fails to lose tonight is the depth of sleep you do not get. Glycine is how you hand it back.
