The slow carb thing is interesting to me--it's part of what the Potatoes Not Prozac idea is all about. Meals are supposed to be meat/protein + veg + starchy 'brown' foods--think potatoes, whole grains, legumes, etc.
That said, I feel awesome w/out eating carbs for most of the day, then eating more in the evening. I don't personally need any kind of slow carbs to make my food last. I can go for hours and hours w/out food, thanks to primal eating (if I'm not in PMS time ). Eating lots of meat and fat and veggies is satiating to me, w/out eating complex carbs. Although I crave them more in the evening...
So, I don't think I liked the 'eat a potato b/4 bed w/out protein' thing from PNP. It's all about doing an insulin spike to raise serotonin, but it just didn't set right w/ me and my stomach felt yucky going to bed so full. I think tonight I might just add some more starchy veggies (not sure it will be a potato) to dinner and see how that works. My sleep was honestly better--not as vivid of dreams and felt more rested, after doing the potato thing, but I don't think I'm greatly seratonin depleted--according to what I've read if I was I would have had ultra vivid dreams at first by doing the potato thing.