The Four Types of Sleep Schedules

Are you a "lark" or an "owl" or do you fall somewhere in between?

JD Hancock/Flickr/Atlantic

Russian scientists have identified four chronotypes. In addition to early and late risers, they say, there are also people who feel energetic in both the mornings and evenings, as well as people who feel lethargic all day. I'm not sure where I fit in. I am most productive in the late afternoon.

More: The Atlantic

Thanks Bruce!