Night time rise of temperature should be investigated for the cause. Sometimes children don't like the taste of the medicine and they throw up. You can use another preparation of paracetamol
with different taste for controlling the temperature.
Beside this do tepid sponging( with lukewarm water not cold
water) of whole body. Lukewarm water causes blood vessels to dilate on the skin surface and thus releases heat from the body. Cold water should be used in case of very high temperature. Maintain hydration by giving plenty of fluids.
Night time fever
can be due to viral infection, malaria
or some other infection.
Consult your doctor for blood test
like CBC, malaria test etc. to reach a diagnosis and management accordingly.