The other factor is environment. High stress environments are a killer. Reading The Programmer's Stone (http://the-programmers-stone.com/about/ http://the-progr

The other factor is environment. High stress environments are a killer. Reading The Programmer's Stone (http://the-programmers-stone.com/about/ http://the-programmers-stone.com/about/) was a real eye opener for me in terms of mental state and what was possible if given enough space.