These days, it's extremely easy to find stimulants of all sorts — caffeine, energy drinks, and the like. However, these things pump you up really quick but then leave your system and you crash. Neither of these is particularly helpful in the long term.
Wouldn't it be great if we could pills that would actually simulate sleep? Rather than giving excited energy, they would just make you feel rested. This kind of thing would sell so unbelievably well at my school. People would just take a few of them and not even sleep anymore.
Naturally, there would be all sorts of other problems, like eyes not having enough time to lubricate, but if we forget about those or assume the pill would solve them as well, then it really could be a miracle drug. Not quite a panacea, but extremely useful.
It could be given to insomniacs, and they wouldn't even have to try to sleep anymore. Somebody recovering from surgery or an injury could take the pill to make their body more rested and able to heal. There are so many applications for something like this that it would be impossible to name them all.
...At the very least, you'd need to stay up so late to possibly list them all that you'd need the drug yourself.