When you wear your waist trainer is kind of personal preference. Some people swear by wearing their waist trainer while they sleep because it's an easy, comfortable way to get waist training hours for the results they’re looking for literally while they sleep. Most people prefer wearing their corset as a foundational piece while awake because it offers many other benefits when they're wearing it, like improving their posture, providing back support, and creating a slimming look and beautiful curves underneath their clothing. We have found that a well-loved corset is more comfortable to sleep in than a new, stiff corset. You will also be more comfortable during the night if you choose to keep your corset laced less snug than if you were awake during the day. While our body is at rest, our body does most of its necessary digestion which can cause our stomachs to expand at night. We have been told that lacing your corset too tightly at bedtime can cause some unwanted bloating and indigestion. If you're hoping to sleep in your waist trainer, make sure to talk with our sizing experts to make sure that you get the best and most comfortable corset for your body.