Stretching after waking feels so pleasant for the same reason it does for cats, but not everyone enjoys the benefits The stretching you do after waking isn’t really stretching. It is a process ...

Yawning indicates, of course, how tired or bored someone is, but it also reveals a lot about human behavior, writes Robert R. Provine, a psychology professor at the University of Maryland-Baltimore ...

Is it true that we yawn when our brains are deprived of oxygen? Most of us can feel a yawn coming on. The muscles in our jaw begin to tighten, our nostrils might flare, and our eyes might tear up as ...