Related Clues:

• Hammock session
• Quite a tidy sum
• Nuclear reactor
• Tot's break
• Boxing day necessity
• Time out for a tot
• It might be taken mid-afternoon
• Sleep at one's desk, say
• Catch 40 winks
• Brief slumber
• Little break
• Go out during the day?
• A short day-sleep
• Short raised fibres on cloth on snooker table
• A daytime doze