> I remember it as one of the most productive periods of my life > so after 3 weeks I had to pack it in. Since it was for such a short period of time it's pos

> I remember it as one of the most productive periods of my life > so after 3 weeks I had to pack it in. Since it was for such a short period of time it's possible you just had sleep deprivation, which can be used to treat depression and cause a big uplift in mood.