For 10 points, name this nighttime action.
This English word, which is not a place name, begins the title of a painting commissioned by Girolamo Marcello in which a cupid at the feet of the title nude was painted out by a later artist. This is also the first word in the title of a painting in which a drinking vase and a mandolin sit near a woman who grasps a walking stick. In that painting titled for this action, a "wandering (*)  Negress" is inspected but not devoured by a passing lion. Bat-like creatures mass behind a man performing this action in a Goya etching that suggests a certain type of it "produces monsters". Titian completed a Giorgione painting of Venus performing this action, which is also being done in an Henri Rousseau painting by a supine gypsy. For 10 points, name this nighttime action.
This English word, which is not a place name, begins the title of a painting commissioned by Girolamo Marcello in which a cupid at the feet of the title nude was painted out by a later artist.
sleep ing [or  dream ing] 