If your dog wakes up acting like an a*****e, he will likely spend the rest of the day as such.  Letting him sleep for eight hours straight will only aggravate the situation when you want him to act like he’s heard the word “heel”. Or “sit”. Or even his name. He will then cap the performance by crying plaintively, laying on his back with his feet in the air looking shockingly like the last dog:

***sigh***