Paid for Nothing
This story takes place back in the dark ages of the 1990s when nanny cams weren’t commonplace. The OP’s mom grew suspicious of her children when they wouldn’t fall asleep at night, so she returned home unexpectedly to see how the nanny was treating them.
That’s when the mother learned what was going on. The nanny was drugging the OP and his sister with sleep medication, so they’d remain asleep the whole time the nanny was paid to watch over them. So, technically, she wasn’t paid to watch over them at all—she was paid for nothing! We sure hope the cops got involved!