It is not going to happen exactly that after the halving you will gain plainly 5 bitcoins instant. That is not something to do with the mined bitcoins but with the bitcoins price that will be really profitable for the quantity of bitcoins is getting near to its limitation. And the lesser supply of bitcoin in the market will make it more valuable.
Its clear to me that you dont know what halving does mean, halving doenst make you double your coins, it might make your coins double in value. Anyway, any of your sentence is making sense, it should be that way less demand more value, but bitcoin isnt currently on the demand and supply game, because there still being coins to be mined. As long you know the real price of bitcoin you cant loose money into the halving as some people lost into this expecting bitcoin at 900 dollars when the real value expected were something like 600-700 dollars.