The homeopathic remedy Rescue Sleep by Bach Flower Essences has the potential to offer deep sleep throughout the night. I have anecdotal evidence it has been helping people.
The active ingredients are included because they address issues that make it impossible to drop down into a good nights sleep. Here is the listing of ingredients and what they are designed to address.
White Chestnut offers relief from repetitive thoughts
Star of Bethlehem softens the impact of shock
Cherry Plum supports a balanced mind when losing control
Impatiens institutes patience when you are having problems with other people
Clematis enhances focus
Rock Rose boosts courage and presence of mind