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Sneezing does not occur during REM sleep, due to REM atonia.(1) Coughing on the other hand does occur during sleep, most commonly due to sickness. The following paper describes a study on the effect of honey for treating nocturnal coughing in children: http://www.ncbi.nlm.nih.gov/pubmed/22869830


Underneath the superficial layers of your skin there are receptors which sense pressure, temperature and pain. These receptors are part of the peripheral nervous system which senses stimuli and they take the message conveying details about the stimulus to the somatosensory cortex of the brain. Here is where the perception of pain, burning, pressure etc is ...


The name used frequently for this phenomenon is "Post-lunch dip". "The post-lunch dip is a real phenomenon that can occur even when the individual has had no lunch and is unaware of the time of day. This dip has its roots in human biology, and may be linked to the size of the 12-hour harmonic in the circadian system. It is certainly exacerbated by a ...


I have to add that the authors do not show any evidence for cell shrinkage. In fact, the word shrink is not mentioned even once in the article. Therefore the BBC article is not correct. To answer your question, all we know is that there is more fluid clearance; the authors do not show the mechanisms for this.

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