servile adjective. âº âeager to âserve and âplease someone âelse in a way that âshows a âlack of ârespect for yourself: As a âwaiter, you âwant to be âpleasant to âpeople without âappearing servile. (Definition of servile from the Cambridge Academic Content Dictionary Â© Cambridge University Press).
That is a good question. In fact, it is not really known why horse yawn. Some suggestions for this behavior are the following: 1  Change of sleeping, napping and waking state. 2  Physical fatigue. 3  Mental stress.  Release of mental or physical stress. Horses will often yawn after a chiropractor session or massage session.
Here are a few of the more common reasons why you might be yawning all the time: 1  Being very fatigued, drowsy or tired. 2  Sleep disorders, such as sleep apnea, that leads to restless sleep.  Disorders that can cause you to be inappropriately tired or sleepy, such as narcolepsy.