I've recently moved ds2 into ds1's room. Ds2 is in a cot and ds1 a normal bed. For the first few days this worked well. Ds2 slept better and ds1 seemed genuinely excited to have a bedroom companion.
But in the last few days things haven't been so great. Ds1 keeps climbing into the cot (defies belief given his tiny legs) and reaching in and hitting ds2 on the head. Ds1 thinks it is hugely funny (ds2 doesn't ), and various attempts to deal with this (stern but firm voice, shouting , time out) are just seen as a wonderful game.
I really would like them to share a room. I can't decide whether it is better to ride this out, hoping ds1 gets bored soon, or to separate them again for a few weeks/months.
This has coincided with ds2 becoming much more active and wanting to play with ds1's toys (as he sees it), which ds1 is not happy about.