101Leafy researched the games.
Sandman Spike

A sleeping curved blade. Its neurotoxin can send an enemy off to their nightmares.
| Class | Sword |
|---|---|
| Rarity | 5 |
| Attack | 210 |
| Sleep | 260 |
| Slots | 2 |
| Price | 3,360z |
Upgrades
| Upgraded from | Sandman Finsword |
|---|---|
| Upgrades into | High Sandman Spike |
Upgrade tree from モンスターハンターポータブル 2nd G 公式ガイドブック (Enterbrain, 2008), page 702.