we get water supply late at night and because of that have to wake in the middle of the night to fill my water tank , need solution like anything which can help me with this problem , please if anyone can recommend , thanks in advance.
You need a 24hr timer switch just like this one:
^ not practical. Better go for complete systems available which include float valve switches for both overhead and underground tanks and logic controller. Or make one yourself
if you are in Karachi,, i can refer you to good system providers for auto checking of line water and also auto motor off when tank is full.