This reminds me of the time I offered to babysit a teacher's 5 year old child. The teacher must have been desperate to canvass her class of 16 year olds for a volunteer.
But as she was leaving the house I realised she hadn't mentioned a specific bedtimefor her daughter so I asked for some instruction:
'Oh Alexandra will tell you when she's ready for bed.'
Even as a 16 year old I knew that this would not end well.
Alexandra was never ready for bed and would not budge for love or money.
She was still awake at 11 when her mother returned (and was appalled to find the 5 year old awake).
What made it worse was that the teacher moaned about this state of play in to the whole class the next day:
'I'm a little disorganised becase Alexandra was so exhausted this morning. Lionheart babysat and let her stay up all night!'