交感神经

xiàng zuǒ cè shuì kě néng huì duì jiāo gǎn shén jīng huó dòng chǎn shēng fù miàn yǐng xiǎng

向左侧睡可能会对交感神经活动产生负面影响。

Sleeping on your left side may have a negative effect on sympathetic nervous activity.