help, my 20 mth old goes to sleep fine in his cot at bedtime, but if he wakes in the night he won't settle in his cot. i am so exhausted i have ended up bringing him in our bed (his cot is in our room) which i have up till now always tried to avoid. we recently tried to put him in a room with his 9 and 3yr old siblings (we live in a 2 bed flat), and tried sleep training, but not only was it disruptive for his siblings, it didn't work in the middle of the night. so we bought him back into our room. does anyone have any advice? please?