If you’re taking a day trip to the Sahara Desert in North Africa, you’re going to want to bring a lot of water and plenty of sunscreen. But if you’re planning to stay the night, then you better bring a snug sleeping bag, too. 

That’s because temperatures in the Sahara can plummet once the sun sets, from an average high of 100 degrees Fahrenheit (38 degrees Celsius) during the day to an average low of 25 degrees Fahrenheit (minus 4 degrees Celsius) during the night, according to NASA.