It's 3 a.m., the neighbor's obnoxious Chihuahua won't stop barking, there's a party going on down the street, and you can't stop thinking about your job presentation tomorrow. At times like these, only one thing will help: Walgreen's 24-hour pharmacy. Not every Walgreen's has one, but if you need your sleeping pills badly enough, or any other drugs you happen to have a prescription for, it's worth the effort to find one that does. The staff is friendly and helpful, not that it matters: Anyone looks friendly and helpful when they hand you that little plastic bottle of magic medicine in the middle of a heinous night.

Readers' choice: 7-Eleven