Quenya 

murmë

slumber

murmë noun "slumber" (LT1:261)

fúmë

sleep

fúmë noun "sleep" (LT1:253). Read perhaps *húmë in a LotR-compatible form of Quenya, since Tolkien later decided that fu- tended to become hu-.

muru-

to slumber

muru- vb. "to slumber" (LT1:261)

lórë

slumber

lórë noun "slumber" (LOS), "dream" (PE17:80)

lor-

to slumber

lor- "to slumber" (LT1:259; the corresponding abstract noun lórë "slumber" is attested in Tolkien's later Quenya, so this verb must still be valid). Cf. also lor "dream" (Letters:308; probably just an Elvish "element" rather than a complete word)