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I didn't mention the deprivation of sleep. I mentioned the deprivation of a night time cycle.
There is an organ in every organism I've studied so far that responds to light and dark. This is directly related to the sleep and wake states of an organism, however, there's more to sleep and wake tied into this organ and the roles between day and night (light and dark) have more of a purpose than just sleep and wake.
Organisms are going to sleep when they are tired whether it's day or night, but the day/night cycles help calabrate the inner environment (inside the organism's body) with the outer environment (that organism's surroundings).
Short term, neurological differences may not be detectable by simple behavior observation unless you know what you're looking for and can rule out other factors to a particular behavior (such as excessive day time sleepiness without rooting from another cause)...and generally not threatening to the organism's overall health depending on the age compared to the organism's natural life span and length of constant day exposure without a dark period. Young ones may recover quickly, because they are fresh and still developing...their systems rejuvenate readily. Sensitive individuals may become sluggish or lag behind all the others later in life...as always being subordinate, etc. and/or may have a lesser life span.
As mentioned, the longer the constant exposure the more neurological damage can occur and is accumilative...meaning it may take half the organism's natural life span before signs of neurological stress show. Also, problems would mostly be related to metabolism.
It's one of the most complicated studies in neuroscience and one of the most difficult to document.
Whew...I've stretched my brain...now it's time for class...LOL...
Have a good day
BTW...don't think I'm accusing you of any kind of neglect. These are things most people aren't going to know about unless they study the subject themselves. I'm always happy to give the insights I've learned over the years to others, whether it makes a tiny difference or a big one.