where are the sleeping ones?

I have been around Lunae for a while now, and found many Ice worms however none of them are sleeping, I even tried to use lullaby and then sketch them, nothing.

Is there a special location or conditions that cause an Ice worm to be asleep that will is considered valid for the quest?

Apparently you need to use the L-rod to find it. Ice Worm (NPC)

Thank you Sakura, I found the information by going through google, there was no link to the page in question. I'll add it.

Or not :/ I could have sworn it brought me to the monster page with the ice worms before... weird.