Classic stall tactic

We're in trouble.
Norah just figured out a classic stall tactic. Since getting "tucked in", she's discovered that she can get out of bed to "use the potty." When I helped her get out of her jammies on this last round, I must have sighed quite heavily. Norah, ever so perceptive, says so innocently "Why you don't want me to use the potty?" Of course, Norah's in-and-out-of-bed deal tonight was also prompted by the fact that Lolo fell asleep quite readily and Norah didn't have her usual bedtime playmate.
Frankly, I'm a little surprised that Lolo never tried this approach to staying up.