Final answer:
The false statement about sleep deprivation is option b) "It has no effect on mood or emotions," as sleep deprivation does impact both mood and emotional stability.
Step-by-step explanation:
The question asks which statement about sleep deprivation is false. Analysing each option:
a) Impaired cognitive function is a well-documented effect of sleep deprivation.
b) The claim that sleep deprivation has no effect on mood or emotions is incorrect, as sleep loss can increase irritability and stress and induce depression-like symptoms.
c) Increased stress levels are another known consequence of insufficient sleep.
d) Physical health is also negatively impacted by sleep deprivation, including effects on obesity, blood pressure, and immune functioning.
Therefore, the false statement is option b) "It has no effect on mood or emotions." Every other option is supported by evidence indicating that sleep deprivation can have extensive negative consequences on an individual’s cognitive performance, emotional well-being, stress levels, and physical health.