Play white noise when you go down to sleep, play it loud. You'll be surprised how quickly you get used to it.
Complaining about the sounds of children playing during daytime hours in a residential area is an absolute waste of your time. And it's unreasonable, even if you it is causing you genuine issues. As a shift worker though the onus is on you to account for the difficulties that daytime sleeping brings. This is one of them.
Trust me, kids don't need any encouragement to scream and make noise. What the creche workers say and do is irrelevant.
i agree with this advise of using white noise... i have small kids and when they are sleeping during the day i use portable fan to create some white noise so that they dont wake up due to cooking and TV noise etc..