Possible Clues:

• Gets serious
• Dries out, with 'up'
• Detoxifies (with "up")
• Gets serious, with 'up'
• Becomes serious
• Sleeps it off, with "up"
• Stops being silly
• Dries out, with "up"
• Recovers from a bender, with 'up'
• Recovers from drinking, with 'up'