My son used to be a really good sleeper and now for the last two weeks he will not sleep in his cot or nap unless he is led with me or his dad for the whole time!! We've let him cry it out for 40 mins and he just gets in a complete state and will not have it!!! Gets in such a state he's catching his breath!! Every night he's in our bed what can we do to get him back to the cot? And advice or tips he's nearly 10 months x