Related Clues:

• What you might do after retiring
• Slumber lightly
• Catch 40 winks
• A short light sleep
• Fall asleep casually
• Fall asleep with head movement?
• Fall asleep with bobbing head
• Go to sleep with head movements
• Go to sleep with drooping head
• Fall asleep with drooping head
• Fall asleep with head movements
• Become drowsy with moving cranium
• 'Fall asleep (3,3)'
• No 33 across? It could be fourfifths of the dozen
• The rest of 29 across just the same, by the sound of it