Does glycine help you sleep better? What studies show about core temperature and next day fatigue
Dr. Jonathan Pierce, PhD: Clinical Psychologist & Neuroscience Specialist
Dec 09, 2025 · 11 min read
Yes. Human research suggests that taking 3 grams of glycine about 1 hour before bed can improve subjective sleep quality and next day fatigue, potentially because glycine lowers core body temperature during sleep. If you are a man who runs “hot” at night, wakes up unrefreshed, or feels flat the next day, glycine is a ...