The April 5, 1943 issue of Life featured a brief story on the problem of sleeping in a relaxed state. It was basically an ad for a new book called You Must Relax: Practical Methods for Reducing the Tensions of Modern Living, written by Dr. Edmund Jacobson, which has been reprinted numerous times over the ensuing decades.

The article wasn’t very helpful or detailed, but the accompanying pictures were neat. Here are the original photographs from 1943, shot by Gjon Mili. They feature some cool stroboscopic effects of a model demonstrating sleep positions both tense and relaxed.

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