Other than the night I stayed up until 2 am, I averaged 8 hours a night until I hit the dissertation deadlines then it went to 9 hours a night. I typically sleep 7.5-8 hours before being on Retatrutide so I was actually sleeping more. I do think quality/hour of sleep was lower but that seems hard to measure.
You seem to have not accounted for sleep loss. That’s usually a huge factor in motivation, focus, intelligence, and mood.
Dissertation stress also affects all of those things and sleep.
Other than the night I stayed up until 2 am, I averaged 8 hours a night until I hit the dissertation deadlines then it went to 9 hours a night. I typically sleep 7.5-8 hours before being on Retatrutide so I was actually sleeping more. I do think quality/hour of sleep was lower but that seems hard to measure.