Do you know what your child is sleeping on? Chances are, if he's like most kids, he can sleep on just about any surface, including the top of his desk at school. According to research from the National Sleep Foundation, 60% of school-aged children - ages 4-12 - complain of feeling tired during the day. If your child is sleepy and cranky during the day, chances are good that it's not his bedtime that's at fault - it's his bed. Simmons Bedding Company has been one of the leading researchers in sleep technology and the importance of sleep since they commissioned one of the first recognized sleep studies in 1925. The company has used what they've learned about sleep and sleep habits to provide mattresses that offer the support needed for restful sleep for adults. Now they've turned their attention to detail toward the sleep needs of children. According to Simmons and the National Sleep Foundation, your child's mattress should meet specific requirements at different points during his or her life. Infant Mattresses: Mattresses for children newborn through age 2 should fit snugly against the sides of the crib to prevent body parts from becoming trapped between the crib and the mattress. They should provide a firm, supportive surface for sleeping. Toddlers Ages 2-4 Toddlers are ready to move out of their cribs and into toddler size beds. Toddlers will sleep 12-14 hours of every day. It's important that they have a firm, supportive and comfortable mattress. The right mattress at this age is as important for you as it is for them - a comfortable mattress that allows your child to sleep well means more sleep for you, and a less cranky tot during the day. Ages 4-12 Around age four, most children are ready to move to a "Big Kid Bed". All the same rules apply - firm, comfortable and supportive - but there are special considerations for children this age as well. Simmons Slumber Time line is specifically designed for children in this age group, keeping all of their special bedding needs in mind.