9. You should try to get a good night’s sleep --- much work

句意：无论你要做多少工作,你晚上都应该保证良好的睡眠（睡一个好觉）
这里,although为一个连词,如果用的话,应是：
You should try to get a good night's sleep although you have much work to do.意思符合但原句语序不对,非从句.
however修饰work,它的用法在这里相当于从句no matter how much work you have to do,
意为无论你要做多少工作