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:NASA SHOCK: InSight records eerie rumble in FIRST EVER detected Marsquake – AUDIO140,000-yr-old ‘Baltic Sea Anomaly’ crashed UFO on seabed will BLOW YOUR MINDNASA asteroid SHOCK: Why 'NUCLEAR OPTION' may be used on Earth-bound rock – 'last resort'Vape WARNING: Researchers discover worrying e-cigarette side effect - ‘Serious concerns'MINI-ICE AGE warning as solar minimum hits ALL-TIME HIGH - 'It's a PERFECT STORM!'Rapist and serial killer’s brain scanned – 'one in a million' find left scientists STUNNED