Copper begins listening in on everybody around her, taking a long rest. Wraithguards are able to rest without losing consciousness, so she interrupts the rest should anything catch her attention.

Spoiler: Sentry's Rest racial feature
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When you take a long rest, you must spend at least six hours in an inactive, motionless state, rather than sleeping. In this state, you appear inert, but it doesn’t render you unconscious, and you can see and hear as normal.