Sleep Science

Glycine for Sleep: What It Does, the Right Dose...

Glycine improves sleep quality at 3,000 mg by lowering core body temperature via NMDA receptors. Here is what the evidence shows, the correct dose, and how it compares to melatonin...

Glycine for Sleep: What It Does, the Right Dose...

Glycine improves sleep quality at 3,000 mg by lowering core body temperature via NMDA receptors. Here is what the evidence shows, the correct dose, and how it compares to melatonin...

L-Theanine at 200-450mg Improves Sleep Quality ...

A 2026 systematic review published in Nutritional Neuroscience - the first to evaluate L-theanine as a standalone sleep supplement in humans - found that 200-450mg/day improved multiple markers of sleep...

L-Theanine at 200-450mg Improves Sleep Quality ...

A 2026 systematic review published in Nutritional Neuroscience - the first to evaluate L-theanine as a standalone sleep supplement in humans - found that 200-450mg/day improved multiple markers of sleep...

13 RCTs, 1,429 Patients: Melatonin's Overall Ef...

A 2026 systematic review and meta-analysis of 13 RCTs (N=1,429) found melatonin did not significantly improve sleep quality in cancer patients overall (SMD -0.85, 95% CI -2.46 to 0.76). GRADE...

13 RCTs, 1,429 Patients: Melatonin's Overall Ef...

A 2026 systematic review and meta-analysis of 13 RCTs (N=1,429) found melatonin did not significantly improve sleep quality in cancer patients overall (SMD -0.85, 95% CI -2.46 to 0.76). GRADE...

People with More Daytime Light Exposure Had 3x ...

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People with More Daytime Light Exposure Had 3x ...

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Sleep and hair health, gold accent motif on black

Sleep and Hair Health: Is There a Connection?

Does sleep affect your hair? The honest answer is mostly indirect, via stress, cortisol and overnight repair. Here is the science, and what sleep can and cannot do.

Sleep and Hair Health: Is There a Connection?

Does sleep affect your hair? The honest answer is mostly indirect, via stress, cortisol and overnight repair. Here is the science, and what sleep can and cannot do.

Near-black image of a calm heart-rhythm motif easing with sleep in gold on black.

Sleep and Heart Health: What the Evidence Shows

Sleep is a genuine part of heart health: both short and long sleep are linked to cardiovascular risk. Here is what the large studies show, and what helps.

Sleep and Heart Health: What the Evidence Shows

Sleep is a genuine part of heart health: both short and long sleep are linked to cardiovascular risk. Here is what the large studies show, and what helps.