You are both missing the whole idea of OMAD, here. If you are not eating until noon, or maybe evening; then it doesn’t make any difference at all how many hours you sleep.
It doesn’t matter if you wake up early or late, you are not going to be eating for many hours anyway.
If you will read the article that Jimmy has posted on the website about controlling appetite and hunger, the number 12 way to help control hunger is to get plenty of sleep.
Here is part of what the blog article says , and it is well worth reading the whole article.
“ Hunger is actually controlled by 2 hormones: ghrelin and leptin
The less leptin being produced results in an empty stomach feeling. The more ghrelin produced results in the stimulation of hunger.
In short, both of these levels need to be controlled, but sleep deprivation will make that impossible.”
Here is the link to the blog article:
https://omaddiet.com/reduce-hunger-overeating-omad/