(HealthDay News) -- Children need plenty of sleep to keep them healthy and happy.

Take note of these warning signs that your child may need a daily nap, courtesy of the Nemours Foundation:

• Acting sleepy during the day.
• Acting cranky or fussy late in the afternoon.
• Difficulty getting out of bed in the morning.
• Difficulty concentrating, hyperactivity, impatience or aggression.
• Problems concentrating on school work or other tasks.