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。

《新英汉大辞典》

So, if you are overtired and cannot sleep then you could get stressed in which case there is a good chance that your bowel will not be working efficiently and you may become constipated.

若你过度劳累和难以入眠，这将影响到肠胃的正常“运作”，或产生便秘的情况。

youdao

Overtired, mentally stalled, he consulted his wrist watch and calculated that there would be time for an hour, or two, of sleep before the dawn.

过度疲劳，精神失控的时候，他会看一下手表，计算一下黎明前还会有多少时间可睡，一小时还是两小时。

youdao