Related Clues:

• Sheep counter's quest
• When most people retire
• Take a nap
• Insomniac's lack
• Take a siesta
• Sack out
• Hypnotist's word
• Test
• Hibernation
• Virgil called it a gift of heaven
• Bedtime call, informally
• From dusk to dawn
• Busy time for fireflies
• Slumber
• 'A gentle thing,' said Coleridge