LO is 3 weeks old. He has a lovely habit of sleeping 6pm to about 2pm, then being wide awake, bored and creating if not played with until about 4.30/5am. Then he'll sleep until 9ish. Whilst in an ideal world I'd just go with it, DH has to get up at 5am for work so needs his sleep, and I'm getting so tired I have to just put him back in his cot and let him create or I'll fall asleep with him on the sofa by about 3.30am. Not good.
We have found though, that if we're busy in the evening (shopping, round a friend's house...) between say 7.30 and 9.30 or even a little later, he sleeps beautifully with just the usual wakings for feeds and nappy changes. Everyone wins that way - he's happy in his cot, we're happily asleep, and he settles straight back down after feed and nappy. Problem is, running out of ideas to keep him awake for those vital few hours. You can only visit friends so many times!!