Related Clues:

• Was out at night?
• Enjoyed REM, say
• Took a day to consider, with "on"
• Was dreaming, perhaps
• Took a day to consider, with 'on'
• Dozed off for a bit
• Went out for a while
• Had dreams, presumably
• Recovered from an all-nighter
• Took a 67-Across
• Month filled with toil ultimately, had a rest
• Went out for a bit?
• Had a restful night