Related Clues:

• Sign of boredom? New approach backfired
• Sleepyhead's sound
• 'So boring!'
• Baby finally, by daybreak, dropping head to show sign of tiredness
• [That is so boring!]
• Action that may be 'contagious'
• What seeing this answer may make you do (sorry, not sorry!)
• Sign that one is spent
• ["You're still talking?"]
• Show your boredom or sleepiness
• No way back when oxygen fails? What a bore
• Evince ennui
• (I'm so-o-o bored)
• Contagious reflex
• Show fatigue