People will take it when they wake up at 3am and can't get back to sleep. It will work really well. So the next night, they wake up again at 3am, can't sleep, so they take it again. Night 3: repeat. Night 4. Night 5. Night 6. Night 7. This is a wonderful drug!
The second week, they go to bed as usual and find they can't get to sleep at all. Now what? Hey, this intermezzo stuff works great at 3am, let's try it now. They take it. They sleep. They wake at 3am as usual, and take it again.
The next night, can't get to sleep. Let's take some more intermezzo. Repeat.
After only a week or two, they will find themselves hopelessly addicted to this drug because they will not be able to sleep without it. If they don't take it, they don't sleep at all.
Even worse - how many people are going to take this at 4am? 5am? 6am? How many people are going to ignore the warning to not take it if there are not at least 4 hours left to the night? How many people are going to take it when they have to get up in two hours, and then fall asleep driving down the road and kill themselves and/or others?
The pharmaceuticals have successfully found yet another way to get people addicted to ambien so that they can make even more money off of our suffering.
Remember who told you first - nothing good will come of this drug, it will only cause more suffering.