Hope it really hot over there, because it is freezing where i live, (Australia) i know that the hot weather makes me more sleepy (if that is possible).  I am very happy i live in the country area of Victoria which is freezing cold, i had to break the ice on top of my outside fish tank on the weekend.  The heater has been going 24 hours a day just to keep my room warm.  To make matters worse we are painting and the paint isn't drying too well because it is too cold.  People with sleep problems (narcolepsy) are just better off living in the cold climate so we stay awake.  So if you go on holiday make sure it is cold where you are going because you miss everything because you are asleep if it is hot.