I have no idea why someone decided that a good sleep is "like a log." I mean... logs aren't ever awake, right? So when do they sleep? And - even if they do sleep - how do we know they don't spend the entire time having fitful dreams?
On the other hand, when our dog goes from 60 to 0 and decides that she is too pooped to party and needs to nap, she is out like a light. No fussing involved, she just goes to sleep.
Sure, it may only be for a couple of minutes, but when she wakes up she's fully recharged and happy to be back at her top speed. Somewhere in that couple of minutes she seems to be getting all of the rest that it takes me 8 or 9 hours to accumulate.
So I have decided that I would like to sleep like a dog. Even though she sometimes dreams in the middle of the night, she still wakes up easily and happily. And then, moments later, can go right back to sleep.
Sounds pretty good to me.