Annals of Internal Medicine Original Research Article

Annals of Internal Medicine, October 2023

A Prospective Cohort Study of 63,676 nurses in the Nurses’ Health Study II prospectively followed from 2009 to 2017.

What’s Interesting about this article?

  • Chronotype or circadian preference is one’s preference for earlier or later sleeping or bedtimes. People who prefer to go to bed later at night, get up later in the day, and feel more energetic later in the day, have an evening chronotype.
  • An estimated 8% of the population have a pronounced evening chronotype, with bedtimes at 3 AM and wake times at 12 noon. This sleep schedule has been linked to poor metabolic regulation with disrupted glycemic regulation and an increased incidence of type 2 diabetes.
  • In this study, nurses aged 45 to 62 years with a preference for later sleep times had more unhealthy lifestyles and, an increased diabetes risk. Lower BMI, exercise, diet, and other healthy lifestyle behaviors decreased some, but not all of the risk.

JournalDoc Comments:

  • This is an extremely large data set with self- reported behaviors by nurses trained to observe and record patient behaviors.
  • It is difficult to separate out the impact of changing work shifts on sleep preferences.
  • The adage of “early to bed and early to rise makes a (man) healthy, wealthy and wise” may also decrease the risk of developing diabetes if you are a middle-aged woman.

Link to Article on PubMed

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