Sleep Science

Glycine for sleep depth and L-theanine for calm shown as complementary sleep ingredients

Glycine vs L-Theanine for Sleep

This comparison gets framed as a contest, but that misses the point. One handles depth, the other handles the wired brain. Here is the split.

Glycine vs L-Theanine for Sleep

This comparison gets framed as a contest, but that misses the point. One handles depth, the other handles the wired brain. Here is the split.

Comparison of glycine and oral GABA showing glycine's stronger evidence and brain absorption for sleep

Glycine vs GABA for Sleep

These two get compared constantly. The difference that matters is not what they do in a lab dish, but what happens when you actually swallow them.

Glycine vs GABA for Sleep

These two get compared constantly. The difference that matters is not what they do in a lab dish, but what happens when you actually swallow them.

Summary of three clinical trials on glycine for sleep with a note on manufacturer funding

Does Glycine Help You Sleep? What 3 Clinical Tr...

Most brands cite the glycine studies and stop there. We give the fuller picture, including who funded the research, because trust means knowing the limits.

Does Glycine Help You Sleep? What 3 Clinical Tr...

Most brands cite the glycine studies and stop there. We give the fuller picture, including who funded the research, because trust means knowing the limits.

Comparison showing magnesium glycinate and bisglycinate are the same chelated compound

Magnesium Bisglycinate vs Glycinate: Same Thing?

One of the most common label confusions in the supplement aisle. The short version: two names for one molecule. Here is why both exist.

Magnesium Bisglycinate vs Glycinate: Same Thing?

One of the most common label confusions in the supplement aisle. The short version: two names for one molecule. Here is why both exist.

Illustration of why sleep lightens after 3am and the triggers that cause middle-of-the-night waking

How to Stop Waking Up at 3am

The 3am wake feels sinister but is usually normal sleep architecture meeting a fixable trigger. How to read it and stop it.

How to Stop Waking Up at 3am

The 3am wake feels sinister but is usually normal sleep architecture meeting a fixable trigger. How to read it and stop it.

Melatonin and Cardiac Arrhythmia: What Three Ca...

Reincarn / Sleep Science / Issue 4 Sleep Performance Digest · Issue 4 · 3 August 2026 A 2026 systematic review found rare cardiac conduction abnormalities in melatonin users, in...

Melatonin and Cardiac Arrhythmia: What Three Ca...

Reincarn / Sleep Science / Issue 4 Sleep Performance Digest · Issue 4 · 3 August 2026 A 2026 systematic review found rare cardiac conduction abnormalities in melatonin users, in...