Open Question: Lack of sleep and increased thirst/dry throat, does lack of sleep cause this?

This week I got a new 1st shift job and I left my 3rd shift job. I haven't been sleeping properly at night because I'm having trouble adjusting. I have only gotten about 2 hours of sleep a night since Sunday, it is now Friday. I have noticed that every day since about Tuesday I have been excessively thirsty and have a dry mouth feeling. I didn't have this before, it just started when I begun lacking sleep. How does lack of sleep cause this? I also have hypothyroidism but it is under control and I know this must be due to sleep deprivation because I didn't have these symptoms last week when my schedule was still "normal" for me. Please let me know what's up? Thanks!