Overnight Babysitter Compensation?

My babysitter has agreed to babysit my kids overnight, on a weekend where both my husband and I will be out of town.  We have two kids, ages 12 and 7.  We will need her to stay with them from 8 PM -  11 AM the following morning.  Do I pay her hourly, or can I pay her a flat fee for the entire time period?  If I pay her a flat fee, what is a reasonable rate?  Thank you for all your advice!

[Moderator] here is past advice including a discussion from a few months ago: https://www.berkeleyparentsnetwork.org/advice/childcare/nanny/overnight

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We pay $50 lump sum for time when children asleep; hourly when awake.

I'd pay a flat fee, and as for the amount, I would ask her what she thinks is fair. I did this with a sitter a few times and I was really surprised by how little she expected. I ended up paying her more than she asked.  I ended up paying her normal hourly rate for the hours I thought my child would be awake, plus an $50 for the overnight.  You might want to give her money to take them out for bagels or something, too.