... of theories that attempt to explain why animals and people yawn. ... to explain
the primary evolutionary reason for the yawn.
Sep 23, 2011 ... People yawn more easily in cooler temperatures, supporting the idea that ...
Gallup's theory predicts that colder outside air should cool the brain ...
Aug 19, 2014 ... Our tendency to yawn when other people yawn has long been incorrectly
explained as primarily an expression of a person's empathy.
Causes may include: Drowsiness or weariness; Disorders associated with
excessive daytime sleepiness; Vasovagal reaction (stimulation of a nerve called
Sep 6, 2015 ... 8 reasons for excessive yawning you probably didn't know about. ... The study
also stated that people suffering from multiple sclerosis suffer ...
If you yawn in class, you'll probably notice a few other people will start ... As this
theory goes, our bodies take in less oxygen because our breathing has slowed.
May 12, 2014 ... A new study has suggested that the reason we yawn has nothing to do ... a video
of people yawning were 41 per cent likely to yawn themselves ...
May 9, 2014 ... A new study suggests that you may not really be yawning because it's contagious
, or you're bored or tired.
Apr 14, 2014 ... Yawning may be the opposite of what we think—not a signal of ... signal of
sleepiness or boredom—one of the reasons Sasha Obama's yawn seemed ...
Provine demonstrated that people report yawning more frequently when ...
Nov 16, 2011 ... Some experts think this happens because yawning evolved as a ... why some
people are more susceptible to contagious yawning than others.