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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The Gemarah in brachos 4b,Rabbi Yeshua Ben Levi says it is a mitzvah to read the shema again.Rav Yossi brings a passuk from Tehillim as proof.It seems that one has an obligation to recite the shema before going to sleep.It seems to me to be a drabbanan.