parasympathetic nervous system

Antonio Guillem/Shutterstock   By  Adam Taylor, Lancaster University   Most of us will be all too familiar with that dopey, groggy feeling of being tired after a restless night. Some social media users have taken tiredness to the extreme, however, by taking part in what they call a “no-sleep challenge.” One 19-year-old Youtuber, Norme, live streamed his attempt to break a world record for consecutive days without sleep. At the […]