Hi Alex, you are not alone on this. Since of late, I too have been experiencing exactly the same effect. I have had to resort to taking two bottles of water to bed for drinking during the night.
Getting towards the morning, I find as if I cant breathe and my nose is blocked like I got a bad cold. I have a few gulps of water and after some time doze off and then resume sleeping peacefully. Sometimes, I have to do this several times, but I finally wake up with no cold or blocked nose at all.......but feeling tired.
Must talk to my doctor.!
Gavin C.