Tips on 4 and 2.5 year old sharing room?

[RooTwo]

We are FINALLY going to move our two in together at night - DD, 4, and DS, 2.5. We tried it last year and it was an unmitigated disaster with DS waking at 5 every day and then waking up DD, so we reverted to separate rooms, but now we really need the space and need to put them back in together. Fortunately DS no longer wakes at 5 (mostly) though he does wake around 6, much earlier than DD. Any tips on how to make this transition as painless as possible - best ways to cope with bedtime (they go to bed at same sort of time, but DD likes a light on/quite music, while DS has darkness - help)- how to stop DS waking DD early in the morn, or will she just get used to it and sleep through it? Etc etc ... any tips most welcome!

My 4.1 and 2.3 yo share. My top tip is to remove as much as possible from their room. Mine absolutely trash their bedroom at bedtime, egging each other on and getting quite giddy. They throw all the books on the ground, empty out clothes from the chest of drawers, throw toys everywhere, and create a huge mess. Drives me loopy.

You may have much better behaved children though.

I find that one can go to sleep before the other, and be oblivious to any noise or movement. But in the morning whoever wakes first invariably wakes the other straight away (at 5.30 .

DD's share a room now at 4.3 and 2.6 months.
I have a rule that they can play in their rooms quietly but not to wake each other up. Lukcily the 4 yr od normally wakes first and she goes to the spare room which s where we keep their toys so she can entertain herself for a bit, when DD2 wakes up she goes in there as well.
Agree with no toys in the bedroom though. It's not worth it. And make sure they each have their own space for the bedtime toys/books stuff which is sacred.

Thanks both ... Hmm, can't remove the toys though, as the bedroom is effectively the playroom too, and I really don't want them all in the sitting room! Need some sacred adult space ... I think the mornings are going to be tricky, as I am sure DS will leap out of bed at some ungodly hour and start pulling the lego out.

This is why we sacrificed our spare room so we still have space for guests but most of the toys are in there!
It might work, do thay have a clock in there? DD's have a digital clock and they are not allowed to make noise or wake each other until there is a 7 on the left. It does work, mostly.