They are Half-Elven, so it might be different for them.
As I recall from reading Morgoth's Ring, Elves only need two hours of "sleep" per night, to be well-rested. In times of need, they could go for about a week without any sort of rest at all, and still remain at their full strength. Definitely a good thing to have!
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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