People on a Ketogenic diet report need only 6 hours of sleep with no adverse effects. I am on Keto plus I also meditate, and I currently sleep 4-5 hours a night, but I'm feeling awake and refreshed. This is both awesome as I used to be an owl, and it freaks me the hell out. This is completely unreal, and I wonder if its going to last or if it is just the usual temporary keto insomnia due to disrupted melatonin synthesis. It needs glucose and takes a while to adapt (Glucose -> L-Tryptophan -> Serotonin -> Melatonin).