If cat's sleep for 20 hours a day - are up for only 4 hours. Do they differentiate being awake or asleep? Do their dreams seem like their actual lives?
I found an article as a follow up to see if cats actually do dream and - of course they do.
"During sleep, our brain releases inhibiting substances to prevent us from acting out our dreams fully, although we may toss, turn and even talk in our sleep. The feline brain works similarly. In laboratory experiments where unfortunate feline subjects have had their brains tampered with so that those substances aren't released, the cats act out their dreams in full. Even laboratory-bred cats which have never hunted, or even seen prey, have been observed to 'catch birds', 'chase mice' and 'bat prey' in the course of their dreams."