The time from 11pm to 6am. It's when all the exciting stuff happens in the streets, like shootings, robberies, drunk driving accidents, vandalism, whatever crime you hear about in the local news.
11-12: robberies and big fights
12-3: shootings and drunk driving accidents
3-6: vandalism, high-speed pursuits and other deadly car accidents
News: "A young black male was killed in a drive-by shooting at 1:30 AM last Monday in the San Francisco Tenderloin, police said."
DAMN IT!! It was in the exciting hours...