If you leave food around your room, empty candy wrappers anywhere, open soda bottles etc.
Then the ants will come....
Jamaica is a tropical country and ants do exist.
Sand flies do come out after dark, like mosquitos. Use a lotion or repelant that you are familiar with.
Otherwise, the hotel can provide you with a coil to burn, which keeps the mosquitos away.
Always keep your room door closed and your balcony sliding doors shut.
If all the above does not convince you then please read this......
I read a most amusing article that suggested another method that is sure to work also. The jist of the story is as follows:
If you have already been bitten, then buy a small flask of overproof Jamaican white rum. Spread this on and arround the bite to instantly kill the poison and to stop the swelling from spreading. Then drink the rest of the contents of this flask and you will not even remember that you were bitten. The alcohol content is 150%.
The Jamaican sense of humour is ever present in our daily lives. Some say it is the only way that they can bear all the hardships that they have to endure during the whole year.
The above explanation is a part of this sense of humour.
IMPORTANT WARNING: Please do not attempt to drink even a mouthfull of this overproof rum. It is only part of a joke.