Dough Fermented Too Fast
I used JMonkey's recipe (link below)
http://www.thefreshloaf.com/handbook/overnight-whole-grain-sourdough-wheat-spelt-amp-rye
Recipe says - Dough development and the first rise - the dough "needs to rise at room temperature for 8-10 hours."
I used 50 grams of healthy wet starter but by 5 hours it had overproofed. The bread sprang slightly in the oven and looks great, although I didn't get the lightness that I wanted.