Related Clues:

• Give the go-ahead
• Tacit approval
• Show sleepiness
• Green-light indicator
• 'A gentle thing,' said Coleridge
• Advice to an insomniac
• Silent okay
• Sotheby's signal
• Do a Van Winkle
• Sack time
• Land east of Eden
• Get some shut-eye
• Okay
• Sign of approval
• Auction gesture