Woke up at night and throat was a little dry and i'm a little worried.no other symptoms.weather is a little colder. currently taking iron supplements ?

The most likely: explanation comes in your third sentence: "Weather is a little colder." Typically, as temperatures drop in fall/winter, windows are closed, heat is turned on and the resulting air is dry. Perhaps you are a bit of a mouth breather..the dry air is likely causing some throat irritation. Could be the beginning of viral illness, too..watch for other symptoms.Only need iron supplements if iron deficient