I'm very oddly knackered and hungry. The drowsiness seems to happen to plenty of people 3 hours in. Most just had a nap then carry on. Some fix it with food. Some have a coffee, you can have coffee with Elvanse, just not advisable.
I'm not going to fight the inevitable. I'm very very tired and weak. I'm going to eat something then sleep for an hour and see if, as it seems to happen with most people, this fixes it.