Related Clues:

• Rest period
• What new parents lose
• It falls quite predictably
• See 1 Across
• Peels backward?
• Dark time
• Usual bedtime
• Z's
• Dark period
• Berth rite
• Yield to exhaustion
• Wiesel work
• Dracula’s shift
• 'To ___—perchance to dream': Hamlet
• Thing broken in time of darkness?