Fitness trackers aren’t just for people. Researchers from Wits University recently used the Philips Actiwatch to monitor the sleeping habits of elephants in Botswana, reports

By looking at activity tracking and GPS, researchers discovered the elephants slept for an average of two hours per day, with most of this coming while standing up. 

The mammals would only be found lying down for around an hour every three or four days, and could go without rest for up to 48 hours if the threat of a predator or poacher was present. In order to remain safe, the elephants would walk miles away from danger.