Enchanted sleep is a pretty standard "Faerie" thing. Rip Van Winkle, &c. Sleep was sweet in Bombadil's house, though not quite enchanted. I forget whether Smith slept in Faerie; seems like he must have but I haven't read Smith in a while.
For Elves: Frodo fell asleep under the elven music in Rivendell; all three hobbits slept deeply and well under Gildor's care in Woody End; and Melian cast a spell of years over Thingol.
The elves of Mirkwood are a little wilder, I think, than the elves of Lorien or Rivendell. They party in the pitch dark, and hunt wild white stags through the black forest. Enchanting a stream doesn't seem beyond them at all.
Elves are good; but they are dangerous. I think we often forget that. "Perilous", said both sons of Denethor. Elves are not to be taken lightly.
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...down to the water to see the elves dance and sing upon the midsummer's eve.
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