Mr. Midshipman Hornblower, by C. S. Forester.
*snif*
Aw, gosh. I just love Hornblower. I mean, come on, I can count on the fingers of one hand and have plenty of fingers left over the number of introspective, intellectual, duty-driven action heros -- y'know, people like me. Plenty of fingers, kiddies.
So, I managed to get myself to go to sleep after reading Mr. Midshipman, but only because I'd actually read a copy of the next book (Lieutenant Hornblower) reasonably recently.