Patrick

Better yet, get her to read that book - I wish I had had the knowledge from that book when I was at school/university. FYI, it was recommended by Bill Gates in 2019 - gatesnotes.com/Books/Why-We-Sleep

Whatever answers and comments you take under consideration, I think you should read the book, "Why We Sleep" by Matthew Walker. Getting at least 8 hours of sleep is crucial for everyone for a number of reasons - especially when learning. You can however, try to shift her sleeping schedule by having regular meal times, spending time outside during the day, no food or drink (except a mint tea, milk or water) after 9pm, dimming/turning off the lights in the evening, disabling the internet between 1am and 6am.