Today is D-Day, the day of the Brexit referendum. Yesterday late afternoon there were 2 polls showing that there was a slight majority in favour of a Brexit, which immediately led to some downside in the market. However, a few hours later the latest 2 polls showed exactly the opposite, a small lead for those in favour of remaining in the EU.
Unless the polling is way off (which could be the case) it is expected to be a very close and will likely to depend on voter turnout. Most young people are in favour of remaining part of the EU, but younger people usually are less likely to go out and vote, making the referendum even more interesting. The weather is not great which could also likely influence voter turnout.
The polls have just opened and there will be no exit poll when voting ends in the UK (22:00 local time). It is expected that the first official results will be known only after midnight (00:00) local time and a good indication around 03:00 local time. We are likely to expect a lot of volatility, so make sure your account is ready and well protected.