A new study has found that indigenous tribes, which are thought to have lifestyles similar to that of primitive humans, sleep for less than 7 hours a night and about 3.5 hours after sundown which runs counter to many widely held beliefs about how much sleep has changed due to industrialization.

A new study has found that modern-day sleep habits may not have changed much from primitive times after all. 

A team assessed data about seasonal sleep times, body and environmental temperatures, and light exposure among traditional hunter-and-gatherer communities in Tanzania, Namibia, and Bolivia. 

These communities have lifestyles largely free of the trappings of industrialize