If you mean the move that makes the user fall asleep and heal themselves, it is only known as Sleep in the Japanese version; the English name is Rest. That aside, it is TM44, and the only one in Pokémon Yellow is on the S.S. Anne...meaning that it's only available until the ship leaves.
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There is no Tm sleep in diamond, there is a sleep talk, which you can find in eterna forest.
That TM is in silph co.
yawn
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There isn't a TM for sleep powder. It's impossible to get. or you can get either an oddish wich will eventually get to know it