Sometimes sleeping on the ground is cooler and more comfortable for chimpanzees. Image courtesy of Flickr user purpleairplane Last month, I wrote about how chimpanzee sleeping habits help ...

Almost all organisms are ruled by the day/night cycle of Earth. In humans, and many other mammals and birds, this is dominated by periods of wakefulness and sleep. But what about trees? They too work ...

Feel like the forest is closing in on you at night? Well as it turns out, that creepy feeling you experience may be more than just your imagination. Though they may not show obvious signs of sleep ...