Somnus

Somnus, the god of Sleep, a brother of Death, and a son of Night, represented, he and Death, as two youths sleeping or holding inverted torches in their hands; near the dwelling of Somnus flowed the river of Lethe, which crept along over pebbles, and invited to sleep; he was attended by Morpheus, who inspired pleasing dreams.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)

Somnath, Idol of * Sonata
Solyman II.
Soma
Somai, Brahmo
Somaliland
Somerset House
Somersetshire
Somerville, Mrs. Mary
Somme
Somnath
Somnath, Idol of
Somnus
Sonata
Sonderbund
Sonnet
Sons of the Prophets
Sontag, Henrietta
Soochoo
Sopherim, The
Sophia, Electress of Hanover
Sophia, St.
Sophie Charlotte