For example, the distance between Mercury and Earth can range from 77 million kilometres at their closest point, to 222 million kilometres at their farthest.
From ages 1 to 3, most toddlers sleep about 12 to 14 hours over a 24-hour period. Separation anxiety, or just wanting to be up with mom and dad (and not miss anything), can motivate a child to stay awake. So can the simple toddler style of always saying No!.
As he gets older, your child will probably stop napping and start doing all of his sleeping at night. Children in daycare and preschool still need about 11 hours of sleep a night, but that amount will gradually decrease. By the time he's a teenager, your child will need only about nine or 10 hours of sleep per night.