Related Clues:

• Sleep stage
• Kind of court or school
• "Losing My Religion" band
• "Shiny Happy People" singers
• Sleep clinic study
• When most people retire
• Deep sleep state
• Dreaming phenomenon
• 'Stand' band
• Michael Stipe's band
• Bedtime call, informally
• From dusk to dawn
• Busy time for fireflies
• Sack time
• Sleep initials