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Aldo,
I do not know the structure or functionality of the corpus callosum in
marine mammals. In some animals. like in man, we have anatomical and/ or
functional asymmetries in the brain. 
As for higher cerebral functions , this may interfere with the
unilateral sleep concept. Not so much for movements, like swimming in
left/ right circles, as dolphins do when sleeping. Furthermore, we have
an electric "crossspeaking" in the corpus callosum to some degree, which
may represent crosslateral information exchange between left and right
hemisphere.

Literature:
Left Brain- Right Brain, Sally P. Springer, Georg Deutsch, issued 1981
at Freeman & Company , New York, 3rd edition 1993at Spektrum, ISSN 3-
86025-007-8

The questions you put may be hard but worthwhile to investigate.  I
would  vocalize it  to " Are their immersion- related ( time-, gas-,
pressure-) effects on brain activity with respect of laterilization.

regards
Matthias

"Aldo P. Solari [APS]" schrieb:
> 
> I  wonder  whether  there  is  any info (papers, grey literature,
> anecdotal data, etc.) on the following issue:
> 
> (i)   Divers  getting  into  either:  (a)  hypnothic  state,  (b)
> pseudo-asleep or (c) asleep while doing long decos.
> 
> The question is the following: do we (humans) have any capability
> (or   pseudo-not-fully-developed-capability)   to   switch   from
> sleeping  with  both  brain hemispheres to one at a time (such as
> dolphins and other marine mamals do) if we are in the water ?
> 
> Are  there any studies of brain activity during long decos ? This
> could  well be answered by electroencephalograms while doing long
> decos when divers are very tired.
> 
> What does the WKPP medical doctor say ?
> 
> A very interesting topic, indeed.
> 
> cheers,
> 
> aldo.solari@ho*.se*
> www.ccbb.ulpgc.es/fish-ecology/solaris
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