I quite agree with the problem of having to trade sleep for other necessities, but personally I didn't realise the actual cost of that trade, and the serious long term effects that 90+ hour weeks might have on me.

In my case it wasn't a second job, it was trying to be more productive to help a fledgling company fly. In retrospect I'd have been a lot more productive with a good 8 hours sleep in my tank every night.

Walker's book on sleep opened my eyes that much that I bought copies for all the family. I've never done that before.