Phases of the Moon

Today was my last Ashtanga class, my introductory course is now over. I have been exhausted today but I dragged myself to it and actually found some surprising peace within the practice before dragging myself home and collapsing on the sofa. Turned out I was not the only tired one there and I was told it was because it was the new moon yesterday. Now I would be the first one to dismiss this but is there anything in this idea? Do people get tired around the new moon and are filled with boundless energy at the full moon? It’s a nice idea and I would never dismiss the truth that our energy levels change with the placing of the sun, so maybe I should consider the phases of the moon more carefully.