What’s the main finding of the research? [originaltext]From artificial lights to

From artificial lights to late-night TV and now our smartphones, modern life is often blamed for ruining our sleep.But this study suggests our ancestors didn’t get any more sleep than we do.The researchers monitored traditional societies in Namibia, Tanzania and Bolivia, where people live like ancient hunter-gatherers once did.They found they slept on average six and a half hours a night.Surprisingly, natural light didn’t have as big an influence as was thought.Most people fell asleep hours after sunset.