You mouth is a playground for bacteria. When you're up and awake late at night, you're usually yawning or occasionally taking sips of something. If you're talking, you're pushing air through your mouth.
When you're sleeping, you are most likely breathing through your nose, so your mouth is completely closed up. These conditions are ideal for bacteria to grow and multiply which gives you that weird nasty morning mouth. I found some helpful hints to avoiding getting that bad taste in your mouth.
howtodothings.com/family-relationships/h... Even when you pull an all night-er... depending on what you're doing, your mouth still needs a good brush and rinse in the morning. I also make my dog sleep on the floor. That helps too.
This could be due to the fact that you are constantly swallowing while you are awake. I'm not saying this is the correct answer, but it is very logical.
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