一般来说，眼周肌肉包括上睑提肌的沉重，和全身其他肌肉的疲劳类似。
Generally speaking, heaviness of the muscles around the eyes, including the levator muscles that open the upper eyelids, is similar to fatigue of any muscle of the body.
因为大脑无法很好地处理否定信息，所以这种指令也被解释为睡觉，而且眼肌也会疲劳，这样睡意很快就来了。
The brain doesn't process negatives well, so interprets this as an instruction to sleep and eye muscles tire quickly as sleep creeps up.
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