The answer provided above is a good answer.
That being said, if you did not lose consciousness and are not having nausea with vomiting then you can safely watch this at home.
Should you develop vomiting or increasing headache or confusion for the next 48 hours then you need to go to the ER. Your symptoms of 'fogginess' in your head COULD indicate that you should go now to the ER. The advantage of this, as explained above, is that you would get a good neurologic exam, and if any abnormalities were found on this exam a CT would be done.
We no longer recommend waking people up at night to make sure they are okay.
Without loss of consciousness you may safely wait this out and use Tylenol/paracetamol for headache.
Here is a good reference for you
And here is another
As you can see there is still disagreement amongst doctors about when to go. If you fell from standing and hit your head my preference would be for you to go now to the ER as that is a high energy injury. If you had the tile fall on your head then I would not.
Ultimately this has to be your decision. Dr Saha's answer is a good one. I am an ER doc and the key in OUR practice surrounds loss of consciousness, amnesia for the event, vomiting, and increasing headache. If you do not have those I think you are safe to try some Tylenol and rest. ANY change should prompt an immediate ER visit.