I had the same problem until I moved into a new house... and then it became clear what the issue was...
Do you sleep in a room with air conditioning sucking the water out of the air?
Some things to try would be limiting the AC and humidifying the room. Put out a wide mouthed bowl of water near your bed. If all else fails, you could try a humidifier. Limiting exposure to the AC was the fix for me.
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