Ple-Sen
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I decided to read an article about pillows on the wiki, considering that this is the most likely clue. I came across this:
Describing pillows, Pliny notes that "we have become so effeminate that even men cannot fall asleep without this device."
Execute Count Orlovsky.
Added 1 minute ago
I'm curious why he decided to mine Nebka on the first night. Because of immunity, he wouldn't have died on the first night, meaning the explosion was guaranteed? But he's not the only one with immunity, and it seems to me that Yaschur is a more popular target for visits. But apparently, he doesn't think so, or there were other motives.