Final answer:
The nursing diagnosis that the nurse will document in the patient's care plan is Sleep deprivation.
Step-by-step explanation:
The nursing diagnosis that the nurse will document in the patient's care plan is Sleep deprivation. Sleep deprivation refers to a prolonged period of time without adequate sleep. In this case, the patient has been in labor for over 28 hours, has not slept, and is disoriented to date and time. This aligns with the symptoms of sleep deprivation.