Nghỉ ngơi đầy đủ. Tập thể dục. Ăn đầy đủ. Duy trì cơ thể ở mức cân nặng khỏe mạnh. Uống thực phẩm bổ sung. Giữ gìn vệ sinh tốt.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
In order to maintain optimal health and well-being, you should make sure you're getting enough sleep. Quantity and quality of sleep is intrinsically connected to our physical and mental health. Sleep has an essential restorative effect on our body and, in fact, a lack of adequate sleep is linked to impaired immune function. During the third phase of the sleep cycle, our bodies' natural T and B lymphocytes (a form of white blood cell) produce “cytokines,” chemicals which target and kill viruses a