Public Sleeping Day is observed on February 28, 2015. Too tired to have something to celebrate today? Then get out and go to sleep first a round in the public ... Inspire yourself by the following tips: Sleep in class or an office meeting, go to a bench in the park and lie down for a while or get on any public transportation and get some sleep.
The purposes and mechanisms of sleep are only partially clear and are the subject of substantial research. Sleep is often thought to help conserve energy, but decreases metabolism only about 5–10%. Hibernating animals need to sleep despite the hypometabolism seen in hibernation, and must return from hypothermia to euthermia in order to sleep, making sleeping "energetically expensive." (With material from: Wikipedia)