@MarqFJA87 She isn't compelled to change the way that she sleeps. It's either that her sleep isn't good and she needs to find some way to improve it, or that the reason she was able to get a good sleep has been changed or removed. She won't be able to use the flower again for another 50 years.
@ninjadork I suspect the same as well.
What a great episode! I love Jazz and Allocer (I love them all, really)! And yes, this is training for the demon world. I expect Jazz will be able to protect himself against his older brother when he's done with his training. And book-smart people...