Will. Not. Sleep.

I have a child who’s been in my care since November. At home this child naps for 2.5 hours. Child is 20 months old. However, at daycare the child will nap for about 20-30 minutes and that’s it. We are lucky if we get 45. Parents are concerned about the lack of sleep. We’ve tried many different things: moving his cot to another location where it’s darker, putting this child’s personal sound machine on during the naptime, having someone sit beside him, having someone rock him, we’ve even tried making a “fort” so it’s like their own little bedroom in the classroom. Nothing is working