Look at Elizabeth Somer's book FOOD & MOOD for insight into cravings and how what we eat causes the body to produce hormones that in turn affect how we feel.
I used to drink a glass of boiled milk with a tsp. of sugar stirred in as an easy, cheap post-workout recovery snack that had protein (bonus calcium too). Maybe it would work for your purposes if no one has a better idea. I've heard calcium's supposed to make you sleepier.
I haven't been following this long enough to see any postings recommending protein at night, nor am I any kind of dietary expert. But I've been eating protein in the morning when I need energy that will stick to my ribs and carbohydrate for supper to fuel the next day's workout and to comfort me. The idea of protein at night is new to me. I hope I can find the postings on it. Maybe I've been doing it all backward.