I've Been Taking Vyvanse For A Month Now And Just

I've been taking Vyvanse for a month now and just increased dosage from 30mg to 50mg. I take it first thing in the morning, around 6:30. I have chronic sleepiness to begin with, and while I feel clear benefits such as increased focus, clarity and less anxiety throughout the day, I'm still sleepy. But around 9 at night I'm suddenly wide awake and more productive than ever, and can't sleep until at least 1am. Considering how it affects my energy so late, would it be beneficial to take at night, or would that make it even worse?