This is a far-fetched claim. The argument doesn't hold water and it is less convincing given that the author only uses his own anecdotal example of how he is forced to concentrate given low energy to back up the claim. Willpower needs energy and thus most people need energy to concentrate on difficult tasks.

I like to work at night for his other reason that there is almost zero distraction save the social media feeds. However, I think my well-being in the day time is being compromised as I do so. Haven't found a good solution to that yet.