Related Clues:

• Out like a light
• Catching z's
• Dead to the world
• Fast follower?
• Napping
• Sawing logs
• Slumbering
• Dreaming, perhaps
• In dreamland
• Taking a nap
• Sound attachment
• Unconscious
• In the arms of Morpheus
• Grabbing forty winks
• Recharging one's batteries, so to speak