Related Clues:

• Limping; weak (argument)
• Weak fabric
• Sound made by sleeper
• Disabled in leg or foot
• (Of an excuse) unconvincingly feeble
• Make noises sleeping
• Unconvincingly feeble
• Noise made while asleep
• It's the last thing one wants to hear at night in broken Norse
• A whistle may follow it in cartoons
• Annoying sleep sound
• Annoyed about note that's heard in the night
• "SKN-X-X!" in comics
• One way to annoy one's spouse
• Certain night noise