Look at Indians instead. We eat a primarily vegetarian diet. I assure you we sleep nowhere close to 16 hours a day. We also work in the sweltering heat etc, which our diet seems more than capable of taking on.
Yeah, eating raw food is great, and eating less is also great. "Eat food, not too much, mostly plants" and all that, but Indian cuisine stands as an example that eating vegetarian food need not be a bland affair.