You are just overtired. There is nothing wrong with you. You'll be all right after a couple days' rest.

你就是太累了，没别的毛病，休息两天自然会好的。

I'm so tired I think I'm overtired.

我好累，我想我是累过头了。

This will reduce your chances of becoming overtired.

这将减少您过度疲劳的可能。

Why is it so difficult to fall asleep when you are overtired?

为何你劳累过度却又如此难以入睡？

She said something about my being overtired and wheeled me back to my room.

她说了些什么，我正在过度疲劳和轮式我回到我的房间。