WHAT IS THE RULING ON LISTENING TO QURAN BEFORE GOING TO SLEEP, WHETHER FROM A CASSETTE PLAYER OR SOME OTHER MEANS?
There is nothing wrong with a Muslim listening to Quran before he sleeps, or listening to a lecture or anything permissible. Indeed it is narrated in the saheeh Sunnah that among the adhkaar to be recited before going to sleep are some du’aa’s and verses and soorahs from the Quran.
Chapter: Seeking refuge with Allah and reciting Quran when going to sleep
It was narrated from ‘Aa’ishah (may Allah be pleased with her) that when the Messenger of Allah (peace and blessings of Allah be upon him) went to bed, he would blow into his hands and recite the Mu’awwadhaat, and wipe his body with them.
Narrated by al-Bukhaari, 5960.
It was narrated that Abu Hurayrah (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings of Allah be upon him) appointed me to guard the zakaah of Ramadaan, and someone came and started to rummage in the food. I took hold of him and said: “I am going to take you to the Messenger of Allah (peace and blessings of Allah be upon him)”… And he said: “When you go to your bed, recite Aayat al-Kursi, and you will have ongoing protection from Allah and no devil will come near you until morning comes.” The Prophet (peace and blessings of Allah be upon him) said: “He spoke the truth even though he is a liar; that was a devil.”
Narrated by al-Bukhaari, 3101.
Listening to Quran before going to sleep and after, during Ramadaan and at other times, instills tranquility in the heart and helps one relax. Allah says (interpretation of the meaning):
“verily, in the remembrance of Allah do hearts find rest”
And Allah knows best.
(Source - Islam Q&A)