What happens to your brain and body when you're hungover, and how to make yourself feel better

Summer holidays must be celebrated with beer and barbecues - that's just the way it is. And sometimes, those celebrations might continue beyond the point of excess.

But Newton's third law states that for every action there is an equal and opposite reaction.

And while he was talking about physics, not biology, it certainly feels like hangovers follow that law, though we might rephrase it as "for every moment of inebriated exhilaration, there is an equal and opposite feeling of pain and unease."

Hangovers are more complicated than just dehydration. In fact, much about hangovers is still a mystery to scientists. But here's what we know.

(And just a note: We're looking at hangover symptoms specifically here, not the effects of long term alcohol abuse. Frequent hangovers could be a sign that you should consider cutting back on drinking.)