Staying up and going to sleep late at night is something I’m all too familiar with. And so is getting a few hours of sleep each night.
I go to bed around midnight or one in the morning on most weeknights, setting my alarm to ring at 6.30am. I thought many others did this, until I mentioned it at work. When I did, my blonde-haired, twenty-something colleague Simone exclaimed, “What? I go to bed at nine. Nine thirty!”

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I can’t imagine myself sleeping at that time every night. “Too early,” I said.