Related Clues:

• They're often taken after all-nighters
• Sleeps at two in the afternoon
• Rudeness reciprocated leads to extremely serious complaint
• Breaks of day?
• Things some sorters make
• Cats' rests
• Prepares for a night out, maybe
• Criticizes to excess, with 'on'
• Criticizes to excess, with "on"
• Quick sleeps
• Parents can relax during them
• Stacks of things
• Afternoon rests
• Midday refreshers
• Quick time outs?