Does olfactory fatigue go away during sleep?

Yesterday night I put some cleaning fluid in the bathtub and started to go to sleep. I could smell it even from my bed and it smelled pretty bad but my nose got used to it so I could hardly smell it as I drifted off to sleep.

Then I woke up again in the middle of the night and the smell hit me just as bad as if I had just put the stuff in again. I know that olfactory fatigue can make you smell things less and less as you are continually exposed to them, but is there any evidence that this is “cancelled” when you are not conscious so that when you wake up you smell everything anew?

Could you have been breathing through your mouth while you were asleep?