exhaustion

Exhaustion is when your body and mind are extremely tired, like after running a marathon or studying all night. It's feeling drained of energy and unable to do anything but collapse.

You probably know that exhaustion can happen physically, like after working out too much or being sick for a long time. But it can also be mental - like when you're overwhelmed with stress, anxiety, or worries about the future. If someone tells you they're exhausted, they might mean their body is tired from lack of sleep, but they could also be talking about feeling mentally drained and unable to cope with everything that's going on in their life.