Because rest is necessary, rest is homophonic with the number 7.

Recuperate, a China idiom, pinyin Xi shūy m 4 ng hēng xī, which means the measures taken to reduce people's burden, resume production and stabilize social order after great turmoil and great changes. From Tang Hanyu's Pinghuai Xibei. Ex.: Allow him to turn over a new leaf, because he has stopped fighting, and he still has a few lives. He is attached to the heavenly heart. ◎ Qing Pen Garden "Song Taizu Gaozong Ten Years Looking in the Mirror".