Is the information stating that houses in which Qiyam al-Layl (night vigil prayer) is performed emit a light seen by the inhabitants of the heavens, and that angels ask about the worshipper and supplicate for him if he does not pray, and that night prayers benefit the deceased in their grave, correct, and what is its source?

We have previously discussed the effect of night vigil (Qiyam al-Layl) on illuminating homes and seeing angels. As for the parts of the human body that retain life after death, their source is only known by consulting specialized medical professionals. Regarding the call and speech of the grave, a weak hadith was reported in Sunan al-Tirmidhi, which Al-Albani graded as weak: "I am the house of strangeness, and I am the house of solitude, and I am the house of dust, and I am the house of worms."