It is generally not recommended to wear a waist trainer to sleep. Waist trainers are designed to compress the waist and create an hourglass shape, which can restrict breathing and cause discomfort while lying down.

Additionally, wearing a waist trainer for an extended period of time, including during sleep, can potentially lead to health problems such as decreased lung capacity, digestive issues, and weakened abdominal muscles.

If you are interested in waist training, it is recommended to only wear a waist trainer for short periods of time while you are awake and engaging in physical activity. It is important to listen to your body and not wear a waist trainer if it causes discomfort or pain. Consult with a healthcare professional before starting any waist training regimen.