
Okay, I'm SLEEPY now. Get out.
The Big Bang Theory Season 2, Episode 21

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

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

♪ Happy kitty, SLEEPY kitty
The Big Bang Theory Season 12, Episode 19

Happy kitty, SLEEPY kitty
The Big Bang Theory Season 1, Episode 11