Appliance of Science: Why do we need to hydrate so much?

This week Dr Naomi Lavelle answers your questions on the super important H2O.

I don’t think there is anyone in Ireland who hasn’t noticed the lovely weather we have had recently. It is a great excuse to down tools and head outdoors into the lovely sunshine and warmth. My son was delighted to spend the day playing outside recently, but after a while he came seeking me out for a little rest and to pose the question “why does the sun make us feel so sleepy?”

It is a good question as we have all experienced it; and as usual, there is likely more than one reason, so I’ll start with the most obvious one; we tend to be more active on sunny days as we like to get outside and partake in more physical activities. But what other factors are involved?