Sense of Smell: Does Yours Increase In The Middle of The Night?

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Let me explain: I've noticed that when I wake up in the middle of the night, my sense of smell gets REALLY strong. I can smell the rubbish in the kitchen to the point of wanting to go and empty it (I've actually gotten up and done that a few times). But everytime when I wake up the next day, I can hardly smell anything. I was wondering if anyone has had a similar experience or if you've read or heard of it happening to someone else. Is the strong smell something I imagine at night? Or is it a form of sleepwalking? I can't for the life of me figure out why it's happening. Any input/thoughts/opinions would be appreciated. Thanks.