[jamiek88]

My wife did that in her early thirties just before her MS diagnosis.

Not to be alarmist but unless you are exaggerating, no mentally or physically healthy human being needs that much sleep.

[chironjit]

I wasnt kidding about the duration but other than this anomaly, she is otherwise normal/healthy.

That said, thanks for pointing it out - it didnt occur to me that it could be a symptom of something.