Possible Clues:

• A Spanish mid-day nap
• Snooze under a sombrero
• Some z's in Zaragoza
• Snooze in Cancun
• Seat is free for the rest of the afternoon
• Post-lunch nap
• Snooze in Tijuana
• Baja break
• Nap, south of the border
• Cuarenta winks?