Dehydrate

I can't believe I was dehydrated this morning. 

When I woke up this morning around 8am, I felt very dizzy. I thought I was sick, got a cold or something. I went back to sleep again. By around 11am, I finally could get myself out of the bed. When I was eating my brunch, I saw one of my housemates. After I told her what happened to me, she told me I was dehydrated, because of the heat, as another of our housemates turned the heater on to 85 degree last night......