C.M.
I agree with the post about following Dr. Weissbluth's advice. Never wake a sleeping baby, don't restrict his naps and try to get him to bed by 6:30 at night. I have a 21 month old and a 6 month old and both sleep from about 6:30 pm to 7-7:15 am (the 6 month old wakes once for a bottle). Sleep equals sleep. The more sleep you give him, the more he will sleep and you will all be much happier and less tired!
Good luck!