This saying, “The sleep of the scholar is better than the worship of the ignorant”, is not a hadeeth from the Prophet (peace and blessings of Allah be upon him) and it is not a report from any of the Sahabah (Companions) or Tabi‘een (Successors). It is not known in the books of Sunnah (prophetic traditions) and hadeeth, and we have not come across it in any of the recognized books of Sunnah, even after extensive searching. 

Rather we found it among the books of the Shi‘ah which are full of fabrications and lies, in a book called Man la yahduruhu al-Faqeeh (4/352-367) by ash-Shaykh as-Sadooq (d. 381 AH), where it says: 

Have not come across this narration in any authentic primary Hadith source. The Hadith should not be quoted until it can be sourced and then verified.

And Allah Ta’ala Knows best  

https://hadithanswers.com/a-narration-regarding-the-sleep-of-a-scholar-being-better-than-the-worship-of-an-ignorant-person/

https://islamqa.info/en/answers/171514/a-fabricated-hadeeth-the-sleep-of-the-scholar-is-better-than-the-worship-of-the-ignorant