Possible Clues:

• Bedtime wish
• Tucking-in wish
• Have one nightcap too many?
• 'Pleasant dreams!'
• Bid the child goodnight and have a drunken slumber (5, 5)
• Be in a drunken stupor and do it in a sound way
• Get a good night's rest
• I wish you a restful night
• 'Pleasant dreams'
• Wish you to be in a drunken stupor, it seems