I have seen a lot of chemical sprays that is being advertised on TV before.
There are so many brands and variations that some that even claim it to be completely safe for humans. I just don't like inhaling chemicals regardless if the advertiser says it is completely safe.
The same thing with those anti-mosquito coils - it's like sleeping while a heavy smoker is smoking beside you the whole night. LOL.

The safest and proven anti-mosquito that I've ever used is the mosquito net that you put around your bed. I haven't find any natural remedy that is as effective as this one. :)

!1UP