You know if you stay up all night,
you're going to be SLEEPY tomorrow.
The Big Bang Theory Season 6, Episode 22
Happy kitty, SLEEPY kitty
Purr, purr, purr
The Big Bang Theory Season 10, Episode 20
You know if my clothes get
too soft it makes me SLEEPY.
The Big Bang Theory Season 5, Episode 6
Really? You'll risk getting SLEEPY...
The Big Bang Theory Season 4, Episode 6
Sleepy kitty.
The Big Bang Theory Season 12, Episode 24