Mackenzie is 3 in June and just starting to drop her sleep - usually if we are out she will just keep going. Yesterday was the first day we purposly kept her up as we were having problems with her going to bed at night (finally falling asleep at 9.30 and taking 1.5 hours to get down). However she does still wake 7 out of 10 nights and can have restless nights. I think I wil be guided by her - today she slept for 1.5 hours during the day as she had a bad night last night (awake for 2 hours 2.30-4.30) and we didn't have a prob putting her to bed at 8pm - she went straight off to sleep. Some of the other kids at playgroup who are all the same age - I think there are 2 out of 10 that no longer have a sleep. All kids are different. Just be guided by your sons behaviour and tired signs. Most of my friends who have older kids have said that their kids still needed a sleep every 2nd or 3rd day for a while just to catch up. So I guess I've been no help really!