Thanatos and Hypnos Picture

or Death and Sleep, the twin sons of Nyx(the personification of night) and her brother Erebus(the personification of darkness). Though some sources say she gave birth to them all on her own, heh.
Hypnos version 1
In Arms of Morpheus
Thanatos and Hypnos
Hypnos version 2
Hypnos version 4