From Fire Emblem Wiki, your source on Fire Emblem Wiki information. By Fans, for Fans.
The Sleep Sword (Japanese: スリープの剣 Sleep Sword) is a sword which was introduced in Fire Emblem: Genealogy of the Holy War. It is one of the four "status swords" available in the Jugdral games. Its power is mediocre and it is very heavy and inaccurate, but it has a good chance of putting foes to sleep when it hits.
Genealogy of the Holy War
Etymology and other languages
|Names, etymology and in other regions
|| Definition, etymology and notes
| • Sleep Sword
• Sleep edge
| • Used widely in the fandom.|
• Used in the "Project Naga" fan translation.
|| Sleep sword