法苑珠林 23.31

23.31

又遺教經云。晝則勤心修習善法無令失時。初夜後夜亦勿有廢。中夜誦經以自消息。無以睡眠因緣令一生空過無所得也。依是行道可得四沙門果乃至菩提。如是行者堪為師範。真良福田得消信施。

Furthermore, the Sūtra of the Buddha's Bequeathed Teaching says: 'By day, diligently cultivate wholesome dharmas without letting time be lost. In the first and last watches of the night, do not neglect them either. In the middle watch of the night, recite the sūtras to rest and compose oneself. Do not let one's whole life pass in vain with nothing attained due to sleep. Practicing the Way according to this, one can attain the four fruits of a śramaṇa and even bodhi. Such a practitioner is worthy of being a model, a true and excellent puṇyakṣetra, able to consume the offerings given in faith.'