To understand the history of waist training  you have to go way back in time. Women have been using corsets as a tool for waist training for thousands of years to hold and train the waist into a desired shape, which is usually an hourglass figure. Corsets have been around for a serious amount of time. Accordingly to the history books, Catherine de’Medici, the wife of King Henry 2 of France, enforced a ban on thick waists at court attendance during the  1550’s. Nobody really knows why she hated “thicker waists” so much, but she did, and that’s what apparently initiated this whole waist movement. The name has changed quite a bit over time. Originally, it was called”a pair of bodies.” Then in 17th century people called the “stays.” It wasn’t until the 19th century when people began to call them corsets. By 1920 corsets began to fall for fashion and girdles and brassieres took over. In 2001 when the movie Moulin Rouge was re-introduced the culture re-introduced corsets and snatching women’s waistlines.

Yes, its completely safe to sleep in your waist trainer. I do not  typically sleep in my trainer but my sister and my daughter sleep in their trainer. My sister and daughter  wear their trainer to work beneath their clothes. I usually wear my trainer outside of the gym 3-4 days a week while working, for 3-4 hours.