They are called RestBites and are chocolate-coated, chewy caramel-flavour squares containing pumpkin seeds. According to the press release, they are designed to help you get a good night's sleep with happy dreams.
I guess I got sent the free sample because I'm a witch and natural remedies containing pumpkin seeds seem rather witchy. Nevertheless, they are quite scrummy - much nicer than anything containing pumpkin seeds sounds like it should taste.
I'm not sure whether they will make me rest any better, but they are certainly more pleasant than any sleeping pills I've ever tried.
And with Halloween coming up, maybe chocolates that send you to sleep are just the thing to give to those pesky Trick or Treaters...