Subways and buses run around the clock, and so do plenty of businesses—including restaurants, pharmacies, copy shops, and even fitness clubs (there's no wait for a treadmill at 4 AM). Other shops and services have more extensive hours than you'll find elsewhere in the United States; for example, there are quite a few places where you can get groceries—or get your hair and nails done—at 11 PM. In general, though, you can safely assume that most shops are open seven days a week, from about 10 to 7 Monday-Saturday, and noon to 6 on Sunday. Bars generally close at 4 am, though some after-hours clubs are open later.