You have unlocked the power of your brass dragon ancestry and can pur foes to sleep with ease.
Prerequisites: Draconic Heritage (brass), sorcerer level 3rd.
Benefit: As a full-round action, you can spend an arcane spell slot to cause a living creature within 30 feet to fall asleep for 1 round. A successful Will save (DC 10 + the spell slot’s level + your Cha modifier) negates the effect. If the creature’s Hit Dice equals or exceeds three times the spell slot’s level, the effect automatically fails.
Source: Dragon Magic, page 16.