Which option best describes the relationship between sleep and immune function?

• A. Sleep decreases immune function
• B. Sleep has no effect on immune function
• C. Sleep boosts immune function
• D. Sleep only affects immune function in elderly

Answer: (C)

Sleep boosts immune function. When you get enough rest, your body can produce and regulate immune molecules like cytokines and antibodies, and immune cells such as natural killer cells become more active. This helps your body mount a stronger defense against pathogens and improves responses to vaccines. Sleep also supports the balance of inflammation and recovery processes that keep the immune system functioning well.

Conversely, not enough sleep disrupts these immune processes. Sleep deprivation can lower the activity of immune cells, reduce antibody production after vaccination, and raise susceptibility to infections. This effect isn’t limited to a specific age group; adequate sleep benefits immune health across the lifespan, so the idea that sleep only affects immunity in the elderly isn’t accurate.