THEME:   substitution of N for T in common phrases   
GOOD ONES:     Why the kids can hardly sleep at night?   MOM AND POP SNORE [store]   
…motto for Jessica Fletcher?   SHE SNOOPS TO CONQUER [stoops]   
File extension   TAB [I've been trained to think computers when I see 
files --- I forgot about "real" files]   
Gang leader?   OUR   
13 for Al, e.g.   AT NO [atomic number, not Gore's billions]      
BTW:   Come up short   OWE [they're not close enough --- the phrase means unexpectedly to lack money for something; to owe means merely an obligation to pay]         
RATING: 
 
  
  
   Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun