DH and I have noticed over the last couple of weeks that ds2 (2.3) has been popping out of his own bed and into his brother's (4.2) at night and at napp times too (ds1 doesn't often have a nap unless he's ill or really tired). Most of the times ds1 hasn't been bothered, only once we heard him moaning "Get off, XXX, go into your own bed" but several other times we have heard them gigling/chatting together and then it all goes quiet, and then when we go in to check ds2 is curled up at the bottom of ds1's bed, like a little dog.
Should I intervene and start putting ds2 back in his own bed, or should I leave them to work out their own dynamic IYSWIM? My approach to any wrangling or bickering usually is either to stay out of it or take away the offending toy, because I do want them to be able to interact with one another (obviously if there was violence, or if one child was consistently the underdog, I would intervene, but they are quite evenly matched and they don't hit each other, they just sort of tumble about and argue)
What would you do, about the getting out of bed?