European Tree Frog (Hyla arborea) yawning on a Bramble (Rubus sp.) bush in the forest in Noord Brabant in the Netherlands© Henk Bogaard/Shutterstock.com You know the feeling. It’s getting close to ...

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You know the feeling. It’s getting close to bedtime, you get sleepy, and you start yawning automatically. You may even find yourself yawning in the middle of the day in a mid-day lull. These yawns ...