障る

1. Origins, structure, and basic meaning

• Structure: 障る(さわる) means to interfere with something going well or to affect it adversely.
• Basic usage: It states that a lack of sleep interferes with the next day's work.
  • 睡眠不足は翌日の仕事に障る。

2. Common pitfalls and similar expressions

• The homophone 触る
  • 触る(さわる) means touching something, while 障る means interfering with it. In 仕事に障る, work is what is adversely affected.