I was broadcasting live from 10pm last night to 8.30am this morning. And having since grabbed a few hours' sleep I feel as though I have woken to a new Britain, and - to an extent - a new world.
The problem is that I am not wholly confident I know what that world will be.
I can see a sharply lower pound and share prices. But they are simply symptoms or manifestations of the new uncertainties.
I can predict with a high degree of confidence that Boris Johnson will succeed David Cameron as prime minister - but that is only because more British people and Tory supporters voted for his side of the European argument than for David Cameron's.
But the truth is that I cannot answer the question of what our future trading relationships will be with the EU and 53 other places where we have free-trade deals via the EU.
I cannot tell you what our future security and policing arrangements will be with the rest of the EU.
I cannot tell you how long our borders will be open to EU migrants and for how long we will be able to up sticks and settle in the rest of Europe.
I cannot tell you what our new immigration system will be, or what level of migration there will be to this place in coming years.
I can repeat what I told you during the campaign, which is that I think we are going to be poorer for a bit, although I cannot tell you how much poorer.
I can tell you that the future of the EU itself is now in doubt, but I cannot tell you how the EU will respond to the greatest challenge it has probably faced.
If you are amazed that people voted for this degree of uncertainty, I will admit to sharing your surprise.
Because let's be absolutely clear, I and all relevant broadcasters and journalists told you day after grinding campaign day that Leave would be a journey into the unknown.
It is why when bookies and investors were last night all assuming that Remain had won, I took for granted they must be right (I never really trusted the opinion polls however).
But a majority of you did not care that leaving the EU would be a trip to an uncertain destination - because you obviously felt the journey we had been on was no bloody use to you.
The status quo benefited others, not you, is how millions of you felt.
That vote has been a rejection of the way we are governed and of the people who govern us.
This is a challenge for Labour quite as much for the Tories. It is a challenge for the security services and military elite, who said we would be safer in the EU. And it is a challenge for the Treasury and Bank of England, whose economic warnings were ignored.
The Scottish Government wants to opt out of the new British challenge altogether. Many in London, who love the EU, will feel completely alienated from the English regions which voted so strongly for Brexit.
Therefore if I have one new certainty it is that nothing will ever be the same again - and that the urgent priority may be to reconnect people with our democratic structures, with the way we run ourselves.