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When you’re not feeling rested and refreshed after a night’s sleep, your thinking is fuzzy, your reaction time drops and you feel sluggish at work. But more and more research shows that sleeping poorly is a big public health worry. Today, on World Sleep Day, two experts explain why.

Left untreated, an HIV infection can cause inflammation in someone’s brain and lead to mental health problems. But antiretrovirals can stop it from happening. Mia Malan finds out how it works in this Health Beat interview.