[evfanknitram]

You do not seem to be talking of the same thing. He wrote:

> It may be indicative of a health issue

Now you write:

> No study I've seen seems to suggest there's any problem with sleeping more up to something like 12 hrs/night I think

So he said it may be an indication of an issue, and you write that it may not be unhealthy to sleep a lot. Those are two different things.

As for your claim: A quick search returns many hits related to issues caused by sleeping more than ~9 hours. I have not reviewed them (I spent 1 minute on this) so can't say if the studies well performed. Example:

https://www.ncbi.nlm.nih.gov/pubmed/19473367 "Prolonged sleep duration (night-time sleep and daytime napping) may be associated with an increased risk of dementia."

But saying that no study would even suggest there would be a problem seems strange considering I found a bunch of them in a minute. Maybe you have done a deeper review of the studies and concluded that they are invalid, or?

[totalrobe]

I think the key here is "associated". Sleep deprivation has also been associated to dementia.

[evfanknitram]

Yes, the link I gave pointed that out. I just questioned that he hadn't found a link since there are so many studies available. If there are associations between sleeping lock and many illnesses then of course sleeping long could be an indication of an issue.