Final answer:
In a client with sleep deprivation, decreased reasoning ability is expected, while hyperreflexia or reduced sensitivity to pain are not commonly observed symptoms.
Step-by-step explanation:
A nurse caring for a client who has sleep deprivation should expect to observe decreased reasoning abilities in the client. Sleep deprivation can lead to cognitive impairments, including difficulties in making decisions, solving problems, and processing information. This condition also typically results in increased irritability, mood swings, and challenges with concentration and memory. However, it is not commonly associated with hyperreflexia or a reduced sensitivity to pain. Instead, individuals may experience heightened pain sensitivity and decreased reflexes due to fatigue and cognitive slowing.