The fact that sleep is not really valued in the "start up" community is a disgusting reflection of stupid people. SLEEP MORE.

A great resource is a book called `Lights Out! Sleep, Sugar, and Survival` by T.S. Wiley. They book eventually gets into some controversial territory without much data to support the claims, but the first half or so is largely about sleep and invaluable. There's a ton of references for the sleep section.

Tl;dr - get the book I mention and sleep. Human sleep cycles change with the seasons and you shouldn't be up too much outside the realm of daylight if possible.