I would have to agree, your choice of ride fuel is odd. Bananas are always good combined with some complex carbohydrates help keep you going. On the mornings I ride, I usually eat a whole grain bagel with peanut butter, a banana, and a cup of coffee followed by a bottled water before I head out. During the ride I drink water mostly but mix in a Powerade or gel every so often and eat a bar if I'm doing 40+ miles, usually about 2/3rd of the way in. Also, after exerting yourself so much from the ride your body has enough recovering to do so eating two pounds of jambalaya afterwards is probably what's making you sleepy. After riding I like to keep the healthy attitude and have a salad, turkey sandwich, or anything that's not greasy then a high protein meal for dinner like grilled chicken with whole grain rice and some broccoli. All of this also depends on the heat too, it's been hot recently and that affects how we feel afterwards as well. I say make some better food choices before, during, and after your ride.