Morning In St. Petersburg, Russia

Morning meals include breakfast, though logically this need not be in the morning, and are varied across cultures. Brunch is a late morning meal.
The ability of a person to wake up effectively in the morning may be influenced by a gene called "Period 3". This gene comes in two forms, a "short" and a "long" variant. It seems to affect the person's preference for mornings or evenings. People who carry the long variant were over-represented as morning people, while the ones carrying the short variant were evening preference people.