Lex was starting to get the feeling it'd be a while before they pushed any buttons. Of course there would be questions. No food but questions. You couldn't get full on questions, just so you know Professor, in case you were wondering...which we're pretty sure she wasn't, eh. This was a lost battle. For some mystical, out of this world reason, you weren't meant to have food around these things. Were they food munchers?--Of course not that would be too exciting to be a muggle invention.

Lex's forehead thudded softly against the desk by her computer and she just sat like that while the class discussion became a thing. At first she didn't know the answer but then she did know the answer thanks to everyone else and didn't feel like repeating.

Don't worry, she wasn't falling alseep, just resting her head and waiting to be told she could push the buttons. Pay no attention to her.