I don't think there will be individual results like there are on a general election.
As far as I know there will just be one announcement once all votes have been counted and checked, that is expected to be around lunchtime on Friday 24th. So no point in sitting up all night.
That is also why exit polls are banned, there is a lot of time between 10pm Thursday and midday Friday for people to bet on sterling rising or falling due to the result ! £ Billions could be made or lost!
Today's 'Times' headline is >>>
'' £ shows large gains on expectation of a 'Remain' vote''
If it is a shock 'Leave' vote and the bankers get wind of it via exit polls there will be a crash in the value of the £ even before the result is announced.