My ds is 13 weeks and nearly always has a grizzle or chatter or even shout for 5-10 minutes before he falls asleep. I leave him to it unless he sounds distressed as my presence just seems to distract/annoy him and make him wide awake again (if he cries I always go to him). Talking to other mums this sounds pretty normal - but at what age do they stop doing it? (obviously not many adults do this so I'm presuming they grow out of it!)