Which statement about children and sleep is true?

1 Children and teenagers are fairly flexible in their adaptation to hours of sleep, so less sleep has minimal impact.

2 Adults are more emotional than children when sleep-deprived.

3 As long as children receive good nutrition, less sleep is will have little impact.

4 Sleep-deprived children are highly affected by a lack of sleep and may have problems controlling behaviors.

5 Sleep requirements vary from child to child, so adequate sleep is difficult to measure.