Possible Clues:

• Tired of lifting weapon at end of day
• One might want to close one's eyes to the noises in there
• Comatose
• Wanting to nod off
• Inclined to nod off
• Ready to drop off weapon for returning to armoury at last
• 3 downs of 11 across is not a wake, it seems when there's no water around
• Sleepy, half-asleep
• Sleepy, somnolent
• Disinclined to stay awake