Hi hellobaby,
I had a baby who never napped. She would finally collapse for about 15 minutes and than be up and full of energy. On rare occasions she would collapse and sleep a good hour sometimes an hour and a half but I never managed to do much with the time because she had already trained me to be waiting.
I have read that major milestones disrupt babies sleepy habits and walking is a major one. Their world's perspective has changed drastically. Now they see the world in a whole new way and it is exciting and different. Usually this lasts for a few weeks and with constancy from the parents, the baby gets back into his/her pattern. I don't know when he started to walk and maybe he is past that time period but just thought I would offer it up in case it is a fairly new cycle.
