Short Answer: To get adequate raw material for melatonin synthesis in the brain, carbs can come any time of day and are best if high-glycemic. To suppress brain histamine levels, carbs in the evening, with low protein and relatively low fat, is best. From among protein, collagen is best at night for the glycine.
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DISCLAIMER: I have a PhD in Nutritional Sciences and my expertise is in performing and evaluating nutritional research. I am not a medical doctor and nothing herein is medical advice.