Who said "I'm sleeping in. Today is not one of my better days."?

This quote is attributed to Snoopy.

I'm sleeping in. Today is not one of my better days. - Snoopy

"I'm sleeping in. Today is not one of my better days."

Snoopy Humor

"I think I'm dying. Send for a doctor immediately!"

"Rats! Another day, another disappointment."

"Sometimes I lie awake at night and ask, 'Is life a multiple choice test or an essay?' Then a dog barks and I realize it doesn't matter."

"I love mankind. It's people I can't stand."

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."