Qenya
lor-
verb. to sleep, to sleep, [ᴱQ.] slumber
lóre
noun. slumber
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
The verb ᴱQ. lor- “slumber” appeared in the Qenya Lexicon of the 1910s under the early root ᴱ√LORO “doze, slumber” (QL/56). The verb reappeared in a present participle form loralyar “asleep” in Koivienéni sentence which was probably composed in the late 1930s (VT27/7).
Neo-Quenya: I’d use lor- as the best available verb for “to sleep, slumber” for purposes of Neo-Quenya; see the entry on √(O)LOR for further discussion.