My DS only slept 2 - 3 hours at a time at that age, and he also had his days and nights mixed up... you're going through one of the toughest times, so try and stick with the routine, eventually it'll work, but right now, he isn't interested in what you want! Hehe

From 5 months old my son has been sleeping 13 hours straight at night, so you will get there, but he's still a little young yet.

The thing that kept me going is that it would get better in a few months... and it does, as much as its hard to believe when people keep telling you that.

Good Luck!