“What do you call a sleeping pizza?”/“A pizzzza.”

A pizza riddle is:
 
Q: What do you call a sleeping pizza?
A: A pizzzza.
 
“Zzzz” indicates sleeping or snoring. “What do you call a sleepy pizza? A pizzzzZzzzZZzzza” was posted on Twitter on August 30, 2013.
 
The “sleeping joke” was posted on Twitter on September 4, 2013.
     
   
Twitter
Dinos
‏@dn0z
What do you call a sleepy pizza?
A pizzzzZzzzZZzzza. #joke
6:44 PM - 30 Aug 2013
 
Twitter
Ilovepokingsmot
‏@queludz
”@pizzaminati: what do u call a sleeping pizza?
a pizzzza
hahaha              
someone date me pls”
6:29 PM - 4 Sep 2013
 
Twitter
Jared Payne
‏@Paynetrain9
what do u call a sleeping pizza
a pizzza                        
ha ha haha ha              
someone date me pls
7:40 PM - 4 Sep 2013
 
Twitter
Anthony
‏@iSpeakComedy
what do you call a sleeping pizza? 
a piZzza  
ha ha haha  
someone date me plz
3:45 PM - 11 Oct 2013
 
Reddit
What do you call a sleeping pizza?
submitted October 21, 2014 by MusicOfTheAinur
A pizzza
 
Twitter
Little Caesars
‏@littlecaesars
Q: What do you call a sleeping Little Caesars pizza? A: a PIZZZZZZA!PIZZZZZZA! #TerribleJokeTuesday
7:01 PM - 11 Nov 2014
   
Henry’s Guide to the Internet
Friday, December 26, 2014
piping hot pizza
(...)
What do you call a sleeping pizza? a piZZZZZZa.
 
Google Books
Sesame Street
Let’s Cook!
By Susan McQuillan
Boston, MA: Houghton Mifflin Harcourt
2015
Pg. 79:
What do you call a sleeping pizza?
piZZZZzzza!