I think you mean infomercial. I dont know the whole of your ideas but it can be like this. There is a kid, their friends play sports but he cannot because he don't have strength to play. Because he didnt sleep last night. After this scene you represent your product. Child eats/drinks from this product and then sleeps like an angel. Next day, he plays with his friends and lots of kids thanks and congratulates him because he saves the match. And after this scene you show your product again. Where can it be sold or number e.t.c.
Edit: After I saw arctic111's answer, I thought I may be got you wrong. If I got you wrong -> It can be sleeping pills, or milk(You know, after you drink milk, you got tired, so there can be a milk just produced to give children an easier sleep experience.