Why your pajamas make night sweats worse
Most sleepwear is made from cotton jersey or flannel. Both absorb moisture and hold it against your skin—which is fine when you are cool, but actively extends the discomfort of a hot flash. You wake up, the sweat has pooled in the fabric, you're cold and damp, and now sleep is broken for 20–45 minutes.
The fix is a fabric that moves moisture away from skin rather than trapping it. This is what "moisture-wicking" actually means—and not all garments labelled that way deliver equally.