i dont know how to get him to sleep through as my 15month old DD still wakes very frequently. but i was having similar issues when she went to day care. she would scream and seem scared when i put her in the cot at home (i think they might have left her in the cot room to cry for a bit longer than i would ever have) and she became scared of cots. so at home and at day care she just sleeps on a matress on the floor now. maybe your 9 month old is a bit little to let sleep on the floor... that would be up to you. anyway the point is, you can always talk to the day care to come up with other sleeping arrangements. pram, swing, etc..