we've just moved so am making some allowances, but ds2 is refusing to stay in his cot and is climbing out, standing on his brother's bed and turning the light on. Monday night this went on until half 10pm so yesterday I kept him up all day then put him down earlier so he could settle before we put ds1(4) to bed. This worked- until 3am, at which point he just wouldn't stay put. He got out of his cot, out of his sleeping bag and almost over the stairgate. Dh took the lightbulbs out in the end but he didn't crash out until about half 6am. We're all knackered and I don't know what to do! Any advice, please?