What is the level of obligation for krias shema al hamita (the recitation of Shema before going to bed)? Is it a mitzvah deoraisa, mitzvah derabanan, is it a minhag avoseinu byadeinu? Maybe it's something else?
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1 Answer
In Brachos 4b, Rabbi Yehoshua ben Levi says it's a mitzvah to read the shema again.
Rav Yossi brings a passuk from Tehillim (Psalm 4:5) as proof.
It seems that one has an obligation to recite the shema before going to sleep, and it seems to me to be a d'rabbanan.
