2 ds (7 and 4) share a room. The younger ds goes to bed earlier in the hope he will have settled down before the older one (very rarely this actually happens!) they keep each other awake, are in and out if bed and their room, waking and disturbing the other ds (9) trying to get to sleep. I am forever up and down the stairs telling them to get back to bed. Bedtimes are a nightmare. Anyone got any advice?