Behaviour going backwards

Having a little bit of a problem with DS's behaviour of late which seems to be going backwards rather than forwards in some areas so am seeking a bit of advice please.

He will be 3 end of September. We've had quite a lot of unheavel in the last few months which resulted in his toilet training going out the window. Had been almost there but have just reverted back into pull ups for now and will try again in a few weeks time. So all fine with that. His behaviour in day care has dis-improved and the girls there are a loss as to how to snap him out of the stage. They've tried all the usual strategies to get the old "him" back but not working. He is not biting or hitting or anything so nothing serious but is just generally not doing what he is told and won't engage or talk to the girls and can be a little bit disruptive to the others. At home he is fine and is chatting away to DH and myself. Also is happy to go to day care ! Upheavel has all ended now and things being back to normal for 3 weeks.

However what we have now started to experience at home is waking in the middle of the night (sometimes more than once). We've never had an issue before with him sleeping through. He simply gets up and comes down to our room - down flight of stairs in pitch black !!!! New bed is arriving tomorrow but don't think it is being in cot that is causing problem as he has plenty of room. Room has air con so don't think it is temp that is causing issue being colder winter nights.

Don't really want to develop habit of him sleeping with us but very hard to keep getting up when you have to go to work next day :rolleyes:
Any ideas or just a stage that they can go through at this age?

Oh that's rough on you all. I'm a co sleep just so you know where I'm coming from. I figure if there has been a lot going on and his no behaving like himself there is no way I'd worry about him coming to your bed. I'd see it as a need that has to be met. So he needs some extra comfort. I'd turn a light on so he can find his way to you. Maybe him just knowing that you are so far away is stressing him.

My DS is the same age and can be a handfull at times. I think if the unsettling has passed then it may be something you just have to wait it out and do what he needs for now. keep talking to the girls at Daycare. I too wouldnt have a problem with him co sleeping with you for now. I dont typically do it but he does go through stages where he will wake in the night. IF you really dont want him in your bed then maybe you can make a bed in his room till he settles down again. Put him to bed as usuall and then put him back into his bed at night, if he gets up again maybe you could sleep in his room.
It sounds like you are doing all the right things and Im sure it will pass. Good luck.