Trilobites: Living Another Day, Thanks to Grandparents Who Couldn’t Sleep Age-related changes in sleep patterns may have helped early humans survive by ensuring at least one person was always alert to nighttime threats. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Lunar Eclipse 2018 revealed: Best places to view RARE 'Blood Moon' in Britain tonightLunar Eclipse 2018: Expert reveals BEST way to see rare 'blood moon' TODAYBlood moon 2018: Stargazers to get STUNNING meteor shower during space event of centuryEclipse 2018: Longest total lunar eclipse today - time, how to watch and moreLunar Eclipse 2018: Blood Moon explainer video REVEALS ALL about historic eclipse tonightEclipse 2018: Why the moon turns red during a total lunar eclipse