
Researchers at Loughborough University studied the role of human hair textures in regulating body temperature and found that curly hair may have helped early humans stay cool while conserving water.
During sleep, the brain undergoes a set of processes to ensure we wake up feeling refreshed. Humans experience different phases of sleep, rapid eye movement (REM) and non-REM sleep, which cause distinct changes in physiology, brain activity, and cognition. During REM sleep, the brain is very active and we experience vivid, bizarre, and emotional dreams.…