Yellowknife, N.W.T. - A local writer is launching a new book about the body's internal clock.

Jessa Gamble has written Siesta and the Midnight Sun: How Our Bodies Experience Time.

She said the book has been in the making for 10 years.

It all began back in university, when she studied the behavior of rats.

"All of nature has this 24 hour cycle that's ingrained in it. It's really part of life on a rotating planet, it's just part and parcel of having this day and night cycle around us, is that we've evolved to anticipate it and to include it in our everyday biology."

Once she moved to Yellowknife, Gamble said her interest in sleep patterns piqued.

She studied how latitude affects the rhythms of wildlife, and traveled across the North examining how the light and dark affect people.

"I went up to Eureka High Arctic weather station and talked to the people who were working up there over the winter, and how they scheduled their day when the light conditions are not giving them any clues as to the time of day."

Gamble will launch Siesta and the Midnight Sun on Saturday Oct. 29 at the Yellowknife library.

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