Something pretty amazing happens when ridiculously cute animals get sleepy -- they get even cuter!
Here's picture proof.
1 - Drowsy Duckling
2 - Pooped Pup
3 - Bushed Bunny
4 - Collapsing Kitty
5 - Flagging Fluffball
6 - Finished-For-the-Day Feline
7 - Weary Meerkat
8 - Petered-out Pug
8 - Dozy Doggie
9 - Fatigued Ferret
10 - Comatose Cutie
11 - Heavy-Headed Hairball
12 - Sluggish Sloth
13 - Teetering Tabby
Main image: i.imgur.com