It can put children to sleep.
When Ivy is kicking up at being put to bed at lunchtime, she comes up with many ploys to avoid having her rest. But if I give her an Arrowroot biscuit, within minutes she's fast asleep.
So far, this method has never failed.
To strengthen the scientific validity of my experiment I upped the sample size to two and testied the Sedative Biscuit Effect (SBE) on Teddy last night. The results, as they say, were replicated.