It is against the law to wake a somnambulist. It is against the law to wake a somnambulist.

Somnambulist: (noun) Someone who sleep walks

In a sentence:

Security guard: You look rather embarrassed, what’s wrong?

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Night porter: I was walking down the corridor when I saw a somnambulist walking towards me.

Security guard: But why is that embarrassing?

Night porter: Unfortunately, he only managed to put on a top hat when he left his room.

Security guard: I see — the perils of somnambulism are many.