Smug early birds take note: Night owls actually have more mental stamina than those who awaken at the crack of dawn, according to new research.
"It's the late risers who have the advantage, and can outperform the early birds," said Philippe Peigneux
He's not actually talking about "performance" in a general, life-applicable sort of way; rather he is talking about performance at specific mental tasks. You wouldn't think that from the way the article is written, however.
You can work against your predispositions, but if you remove social constraints, your natural pattern will quickly re-emerge.
Furthermore, your subjective assessment of your productivity along the day is not really meaningful in this context.