Natenberg is will cure any insomnia problems you may have.
IMO the Sinclair books are the best value, the second one is just a good overall trading book, one of the few worth reading.
Truth! I had to drag myself through the last half of it, but it's a great reference. Unfortunately I may have to re-read it sometime on the future; I'm not sure how much of the info I absorbed the first time, what with my eyelids drooping.
I'm currently reading The Volatility Edge in Options Trading by Jeff Augen...excellent book so far, though he loves his equations when discussing option pricing theory (and I'm certainly not a math major).