In a 2009 study, people sleeping less than 7 hours per night had a 3 times greater risk of catching a cold than those with 8 hours or more. Lack of sleep can also affect how fast you recover if you do get sick. Long-term lack of sleep increases risk of obesity, diabetes, and heart disease.
Fatigue undermines the body's inflammatory response, crucial for fighting infections. Lack of sleep leads to higher levels of inflammation, impacting the immune system. Lack of sleep increases the risk of serious infections, like pneumonia.
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