Decaf latte

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A Decaf Latte
A 2007 Consumer Reports study found that the amount of caffeine in "decaf" drinks sold at coffee shops varied from less than 5 milligrams to levels high enough to interfere with sleep. While a generic 8-ounce cup of decaf has 3 to 12 milligrams, a decaf from Dunkin' Donuts had 32 milligrams—as much as a 12-ounce bottle of Coke.

A better sleep snack: There's no conclusive proof that chamomile tea will put you to sleep, but it's been used for thousands of years as a natural calming remedy.

Next: What to eat for deep sleep