Related Clues:

• Half or fast condition
• Numb
• Bad way to be at the wheel
• Bad thing to be at the wheel
• Almost out
• Due for a drop-off?
• Ready for bed
• Nodding, perhaps
• Ready for a nap
• Ready to retire
• About to go out
• Zonked out
• Yawning, most likely
• Out at the switch?
• A Disney Dwarf