I find that they change their sleep/waking patterns really frequently. Once I see tired signs I put DD in her cot even though she won't sleep- it is her down time and mine. I leave her there for about an hour as long as she is only playing, not screaming. Work out how long your DS needs to sleep (there are charts in books etc that are only guides) in 24 hours- say 16 hours, for example. Then if he has 12 hours at night, he needs 4 during the day. Divide these into 3 for a morning, midday and afternoon nap and put him down at set times eg 9am, 12pm, 3pm even though sleep may not happen. He may be overtired if he is screaming when you put him in. Could you feed him to sleep until he gets back into a napping pattern? If putting him inyour beds works foryou, keep doing it. There is no harm. Don't worry too much about routine. As I said, it will change again anyway and will do so for the next year maybe.