Which of the following is NOT an effect of sleep deprivation?

• A. Improved concentration and memory
• B. Increased irritability and mood swings
• C. Decreased reaction time
• D. Impaired immune system function

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the effects of sleep deprivation by reviewing psychological and physiological research findings on how lack of sleep impacts the brain and body.
2. Step 2: Identify common negative effects of sleep deprivation, such as increased irritability, mood swings, slower reaction times, and weakened immune system function.
3. Step 3: Recognize that sleep deprivation generally impairs cognitive functions, including concentration and memory, rather than improving them.
4. Step 4: Compare each option given in the problem to the known effects of sleep deprivation to determine which one does not fit the typical pattern.
5. Step 5: Conclude that 'Improved concentration and memory' is NOT an effect of sleep deprivation, as sleep loss usually leads to declines in these areas.