Prognosis

What Will That Espresso Martini Do to Your Sleep?

Caffeine reaches its peak effect as quickly as 30 minutes after you ingest it, and it can stay in the body for at least five to six hours.

Photographer: Astrid Stawiarz/Getty Images for NYCWFF
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Hi, it’s Cathy in Chicago, where a recent night out with friends led me down a rabbit hole about sleep, caffeine and fancy cocktails. More on that in a moment. First ...

Espresso martinis are everywhere these days — at restaurants, in the news and on TV. Even my last flight served a canned version.