DS is a chucky baby and because we used cloth nappies, i found that by putting one of the bamboo inserts for the nappies under his head in his cot, when he did chuck a bit in his sleep, it soaked it up and left the sheet underneath dry. then all i had to do was change it by the next nap or after a couple of naps (i would turn it around and over a couple of times if it was just a tiny chuck). if u wont be using cloth nappies, u can buy just bamboo material from a couple of different websites. HTH