Naptime to quiet time transition

Ok i have a 1yo, 4yo, and 5yo. My 1yo is a feather light sleeper so up until now ive made the 2 older boys lay down in their bed for nap and now quiet time. But i feel bad making them lay in bed but if they play in their bedroom(next to my daughter who is the light sleeper) it wakes her up and she NEEDS a nap still desperately. Sooooooo im trying to get some ideas to keep two rambunctious little boys quiet for 2 hours yes i know its probablyas impossible as i think. Lol