Sleeping is a naturally recurring state of relatively suspended sensory and motor activity, characterized by total or partial unconsciousness and the inactivity of nearly all voluntary muscles.
It is distinguished from quiet wakefulness by a decreased ability to react to stimuli, and it is more easily reversible than hibernation or coma. via Wikipedia
Apart from the normal definition, today I am presenting some very cute and funny pictures of babies, few animals and grown-ups while sleeping.
Like any extreme activity, it requires the nerves of steel, good choice of timing, location and the absence of suspicious cops. All this however is easier to achieve, because you are, well… asleep, so you can trust the unseen powers to take care of the rest.