Related Clues:

• Call it a day
• More of the quote
• Hit the hay
• Get some shuteye
• Retire for the night
• Turn in
• Hit the sack
• Retire
• Go to bed
• Call it a night
• Say good night
• Submit, as homework
• Turn in, perhaps using items hidden in 17-, 24-, 48- and 57-Across
• Informally, go to bed
• Go to bed, changing direction