It’s 3 AM. You jolt awake, drenched in sweat, peeling off your damp shirt in frustration. If this is your nightly reality, you’re not alone—but why do I sweat so much in my sleep when the room is cool, the fan is on, and I haven’t had a nightmare? The truth is, your body could be sending signals through nighttime sweating , and those signs might be more revealing than you think. 🧠🔥 Thermoregulation Gone Haywire: What Your Brain is Doing While You Sleep When your body drifts into sleep, it doesn’t just “shut off.” It enters a series of complex cycles governed by the brain's hypothalamus—the same region responsible for body temperature regulation . If you find yourself asking, " why do I sweat so much in my sleep even with air conditioning?", the culprit may be an overactive autonomic response. Some people experience what's known as sleep hyperhidrosis , where the sweat glands remain abnormally active even when the body is at rest. This isn’t just annoying—it c...