Sleep is a state of physical rest. The muscles relax, lowering blood pressure and body temperature, and the brains to take almost nothing that what is happening in the area. Sleep consists of five phases, each with its own brain activity. It starts with a light sleep (stage 1 and 2), then you fall deeper and deeper into sleep (stage 3 and 4).
The last and fifth phase is the well-known-REM sleep (rapid eye movement), also known as sleep dream. This is characterized by completely relaxed muscles, but the heart rate and respiration are irregular, and blood pressure rises. The eyes move rapidly back and forth. This is the phase during which dreams. If REM sleep is completed, then again begins a new sleep cycle.
In this video you will funny an amazing way to wake your dog, give him some treats
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Video: Facebook / I Like Animals