Related Clues:

• Go to sleep. It's almost twelve
• Drop off nearly twelve
• Last of twelve dropping off to sleep
• Forty winks or 9.6?
• Get some sleep, it�s almost twelve
• A light sleep
• Bridge partners mentioned river siesta
• Sleep induced by small nitrogen leak
• Drop off notes for auditors
• Catch a few z's
• Weep after a couple of cardinals drop off
• Visit dreamland
• Loser's fatal mistake?
• Clock radio "Shut up!" button
• Nap of snooker baize that's been cut off-centre