----- Original Message ----- From: "Amadeus Schmidt" <[log in to unmask]> A high-protein evening meal therefore reduces the plasma ratio of tryptophan to the competing amino acids so less tryptophan is carried across the barrier and less reaches the neurons. Conversely, a high carbohydrate meal in the evening tends to increase serotonin utilization levels. But of course.... Foods higher in carbohydrates(read tryptophan) will put one to sleep. This is why students are falling asleep in classrooms. High carb diets. Look at any school menu. It would choke a cavemate to sleep. Cheers, Oliva