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The short answer: It's a very bad idea. Waist trainers constrict your middle area which might be different when standing up versus laying down while sleeping. In addition to wanting to be awake and aware of the changes when using the waist trainer in case you feel uncomfortable.
Also know, can you wear Sweet Sweat to bed?
It is not a slimming magic belt since it's designed to boost your exercise along with a healthy diet. It is generally not recommended to wear it while sleeping and not to make you lost a pound while sleeping.
Also know, do sweat belts help lose belly fat?
An abdominal sweatband makes you sweat more, so any weight you lose is likely to be water weight, which will come back when you drink water after your workout. In fact, these bands may make it even harder to lose fat, as they make it harder to use your abdominal muscles, limiting the number of calories you burn.
It is not recommended to wear a slim belt or sauna belt to bed, as most manufacturers recommend limiting sessions to three hours or less. If you, make sure to work your way up to it. You also are unlikely to see dramatic results unless you are more active while wearing it.