What is meant by Al-Bahuti's saying: "midday" in the context of the desirability of sleep; is it before or after the Dhuhr prayer?

Al-Qaylulah (midday rest) is recommended, even if it does not involve sleep. Some scholars are of the view that al-qaylulah takes place before zawwal (declination of the sun from its meridian), while others hold that it can be either before or after zawwal. Evidence that it occurs before zawwal is that the Prophet (peace be upon him) and his noble Companions used to take their midday rest before the Friday prayer.