(HealthDay News) �?While a full night's sleep is vital to good health, stamina and alertness, a short nap also can do wonders for your mood and performance.

The National Sleep Foundation offers these suggestions for good napping:

• Limit the nap to 20 minutes to 30 minutes. This shouldn't leave you feeling groggy or interfere with your ability to fall asleep at night.
  
  
• Make sure you have a good sleep environment. Choose a cool, dark and quiet room to help you fall asleep and have a restful nap.
  
  
• Choose the right time to nap. Your body may not be ready for more sleep if it's early in the day, while napping too late can cause problems falling asleep at bedtime.