A closer look
Your immune system is like a vigilant guard, but even guardians need rest. After just one sleepless night, scientists can measure noticeable dips in your virus-fighting cells and antibodies. It’s as if your internal army didn’t get its marching orders and shows up sluggish at roll call. That may explain why exhaustion so quickly translates into catching colds or struggling through flu season. Sleep isn’t just about feeling alert—it’s a nightly training camp where defenses sharpen. Miss that lesson often enough, and your body’s fortress can be far easier to breach.
