Related Clues:

• Midnight activity, often
• Be snoozing
• Hibernation, for example
• Backs Hull school from the beginning for dropping off children, for instance
• Energy-saving mode
• Son starts to look extremely exhausted -- prompting this?
• 'The sweetest gift of heaven' (Virgil)
• "To __: perchance to dream": Hamlet
• "Talking in Your ___" (The Romantics)
• Romantics "Talking in Your ___"
• Keith Richards-sung Stones jam "___ Tonight"
• Bon Jovi "I'll ___ When I'm Dead"
• 'Silence is the ___ that nourishes wisdom': Bacon
• Get some sack time
• Catch a few winks