
Sleepy kitty.
The Big Bang Theory Season 2, Episode 21

♪ Happy kitty, SLEEPY kitty... ♪
The Big Bang Theory Season 5, Episode 6

Happy kitty, SLEEPY kitty
The Big Bang Theory Season 6, Episode 22

And a SLEEPY Sheldon is a cranky Sheldon.
And a cranky Sheldon...
The Big Bang Theory Season 6, Episode 22

Really? You'll risk getting SLEEPY...
The Big Bang Theory Season 4, Episode 6