Drinking this potion has the same consequences as having a peaceful night of uninterrupted slumber. You drink the potion, wait about a minute or so, and then you will feel as refreshed as if you had just gotten up from a perfect night’s sleep.
You can’t use Bottled Sleep indefinitely, though. If you don’t get some real, non-magical sleep, the potion eventually stops working. With regular sleep, you can get back to the point where the potion is effective again.