I only know 3 moves that makes Pokemon fall asleep.
GrassWhistle - Roselia learns it by level up
Yawn - Dunsparce learns it by level up
Hypnosis - Drowsee knows it when captured in Pokemon Heart gold And Soul silver.
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There is no TM "Drowsy" in any Pokemon games. You maybe thinking of the move "Yawn" that makes the target drowsy in one turn, and makes them fall asleep the next. However, this move is not available via TM or Move Tutor either. There is a Pokemon named Drowzee also.
yawn
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.
NOWHERE.The TM trick is not available as a TM in Pokemon Emerald
no thunder fang is not a TM in Pokemon pearl no thunder fang is not a TM in Pokemon pearl