Related Clues:

• Early hr.
• When 'SNL' ends
• Hour after midnight
• Night owl's time
• Graveyard shift time
• Wee hr.
• Time after retiring?
• It may be indicated by a stroke
• When 59-Across ends, in NYC
• Two bells, in the Navy
• Witching hour follower
• Graveyard shift hr.
• Early feeding time
• Midnight follower
• Late-night time