Siesta is a Spanish term that refers to an afternoon nap or rest period, usually taken in the early to mid-afternoon. It's a common practice in many countries with warm climates and is believed to have originated in Spain during the Moorish occupation when people would take a break from their activities to rest during the hottest part of the day. The siesta can last anywhere from 30 minutes to several hours, depending on cultural norms and individual preferences. It's seen as an opportunity to recharge physically and mentally before resuming work or other daily activities.