My 3-yr old has been waking regularly at night since the summer (any time between 1am and 4am) and is v hard to settle back into his bed. Occasionally he plays ball but at other times I have to get into bed with him, wait until he has dropped off (which can take ages) and then return to my own bed. Don't want to get him into the habit of sleeping with us but I want a more-or-less guaranteed night's sleep. He responds sporadically to threats and bribes but I'm running out of ideas - help!