I used to sleep during the day as much as a could, but in those first couple of months I was just too anxious - too anxious at the prospect of just drifitng off and then being woken up again! This anxiety was actually very detrimental, as I wasnt falling asleep as easily as I could have.
After a few months though when Aidyns nap patterns became more regular I would nap with him... even now when he is nearly 3 I find myself napping at the same time he does if I have not had a good previous nights sleep. It makes a world of difference for me, because I function SO badly when lacking sleep.