Around one year old the sleeping is a big problem. hehe!

I didn't try to train my son's nap. I just forced him laying down and co-slept for almost two hours, even when he woke up in the mid-time I held him firmly and won't allow him to get up.
Of course I couldn't control his nap time when he was in the Daycare. As per his teachers' records, he could only slept for 20 - 40 minutes. Such situation was lasting more than two months.