Agree with Loretta - just spray the room with Raid before you go out of an evening, and close doors and windows. Also, I have found that the insect repellent wipes from Boots are really effective. Just apply to exposed areas (!) before going out and they stay off you!
Having said that, the mossies haven''t been nearly as bad for the last couple of seasons; I used to get bitten alive, but last year (and earlier this year) there was no problem.