forty winks

Cats in the wild must be on the alert in order to survive. When your domestic cat sleeps, his finely tuned senses are still active and ready to spring into action. Watch your cat while he's napping. His ears rotate as he stays in touch with his environment, and if he hears a noise or senses that someone is approaching, he will open his eyes to assess the situation before falling back to sleep. If you try to wake a sleeping cat, he can transform from deeply sleeping cat to one that's fully alert in a matter of seconds – and then back again

~source: www.petplace.com/cats/sleep-behavior-of-cats/page1.aspx

 

 

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