Many diseases are transferred with mosquitos (malaria, yellow fever, Japanese encephalitis and other tropical diseases). Mosquito repellent is therefore mandatory. Mosquito repellent should contain DEET in a concentration of 10-20% to be effective against mosquitos. This will provide protection for 3 to 4 hours.
Since the substance (DEET) is toxic, you should make sure that children does not get it into the mouth and that it is washed off when no longer needed. It only needs application after sunset.
The room you sleep in should be sprayed (permethrin) for mosquitos right before bedtime and you should make sure that any windows and doors you may open have a mosquito net. You can also choose to sleep under a mosquito net.