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We have one like this that hey put on a cot. My LO is a cuddler so we also send in an extra blaket.
https://www.amazon.com/Lambs-Ivy-Nap-Mat-Elephant/dp/B004QXX06I/ref=sr_1_4?ie=UTF8&qid=1370715433&sr=8-4&keywords=toddler+sleeping+bag
Re: toddler sleeping bag/ nap mat
https://www.amazon.com/gp/aw/d/B008EF1R7I/ref=mp_s_a_1_5?qid=1370699655sr=85pi=SL75
If they have cots you could also do a crib sheet, blanket and travel pillow.
We have one like this that hey put on a cot. My LO is a cuddler so we also send in an extra blaket.
https://www.amazon.com/Lambs-Ivy-Nap-Mat-Elephant/dp/B004QXX06I/ref=sr_1_4?ie=UTF8&qid=1370715433&sr=8-4&keywords=toddler+sleeping+bag