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correlational
mixed effect

Glycine might work differently than sleeping pills like benzodiazepines to improve sleep, according to this study

Scientific Claim

Glycine ingestion (3 g) before bedtime is associated with different effects on sleep quality compared to traditional hypnotic drugs such as benzodiazepines in individuals with chronic sleep dissatisfaction

Source Excerpt

Thus, a bolus ingestion of glycine before bedtime seems to produce subjective and objective improvement of the sleep quality in a different way than traditional hypnotic drugs such as benzodiazepines.