I haven't tried a reward chart yet but I was thinking of getting one and also as someone suggested I'm going to try a gro clock. Maybe if I tell her she can pick her own prize once she gets so many stickers for sleeping until the sun comes up on the clock it might work. At this point I'd try anything!
I hope you find a solution too it's a nightmare! I'm pretty sure I'm now starting to get addicted to coffee as I need so much of it to stay awake lol 😏