Short naps can improve memory, increase productivity, reduce stress and promote a healthier heart

Short naps at the right time of day can benefit alertness and overall health in myriad ways. Tara Moore/Digital Vision via Getty Images

Napping during the day is an ancient custom that is practiced worldwide.

While some people view napping as a luxurious indulgence, others see it as a way to maintain alertness and well-being. But napping can come with drawbacks as well as benefits.