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Psychobabble aside, I have dozed several times when on long decos at the 10-15' stop...especially when you come out of a cave or come up from a long, deep lake/quarry dive at night, the water's clear, you've been working too hard (out of the water; for weeks not hours), you can see the moon, and the bream are not nipping at your cheeks... Your cylinders roll you onto your back in the shallows, all you can hear is the hiss of breath; your eyes aren't yellow (thanks, Depends), you feel the warmth of the water (or your drysuit); the shimmer of the moon through the ripples makes patterns, a little heat lightning flashes = extreme relaxation, even naptime. Actually, one of the biggest frights I've ever gotten in the water was when a certain buddy of mine (generally very good, but concerned), shook me violently at a 10' stop in NC after I had been napping for about 10 minutes. He shook me 'cause he thought I was unresponsive (he was right!), but I gotta say, I had waaay more gas than he did....... ABRILL ----- Original Message ----- From: "Wendell Grogan" <wgrogan@dc*.ne*> To: "Aldo P. Solari [APS]" <aldo.solari@ho*.se*> Cc: <techdiver@aquanaut.com> Sent: Sunday, 11 March, 2001 21:05 Subject: Re: sleep on long decos (?) > Since I run a sleep lab for a living, just a couple of quick comments. > I have no doubt (based on what others, like Trey, have written, and what > I have experienced personally) that you can get into a light sleep stage > on deco. How deeply asleep one could get would be very individualized. > Some people could never relax enough to get more than slightly drowsy, > whereas if you have studied self hypnotism or other extreme relaxation > techniques, you could probably get into a fairly deep trance while still > retaining enough awareness to monitor things like timer beeps or > pressure changes. > It would be impossible to study brain physiology during actual dives due > to the salt water which would short out the electronic connections. > There have been EEG studies done during dry deco, but this is very > clearly not the same situation as being in the water. There would be > nothing to keep a diver from napping during dry deco. In the water you > have to be aware of your buoyancy, current, large toothy predators, etc. > Wendell G > > > "Aldo P. Solari [APS]" wrote: > > > > 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 > > ___ > > > > -- > > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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