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I am in no way as knowledgeable as other members of our region, but I do remember a few passages from Lotr where it was said (or implied) that sleep for elves is more of a meditative process, where their mind is asleep but their body is able to do autonomous tasks (like walking, running etc) and even remaining alert.

I believe that it was also implied, in some paragraphs about Legolas, that elves dont really need that much sleep, so I imagine that if they do rest, they only need it once in a few days.

Now about sleeping arrangements, in Elrond s house and in Luthien s house (i believe) they actually had resting chambers with beds in them, although I am unsure of any paragraph where it was clearly stated that an elf lay to rest in it.

Then we have in the Silmarillion a paragraph where the elves Turgon and Finrod went to rest in the open plains and dreamt the places where they d found their kingdom. And the bit where Miriel rested and went to a deep sleep and then died, if that counts.

I hope that someone else, more knowledgeable, can provide some better input!