Agreed. I work 8 hours every weekday with an hour train ride- not much time to sleep after eating and leisure are accounted for.
Something has to go if you don't have time to sleep. That is the most important thing you do, you can't function or stay sane without sleep. I'm not kidding. Priority should be something like 1. Sleep, 2. Drink and eat, 3. Work, 4. Leisure.
If you have to, use the train ride to sleep. That is two hours per day of sleep if you can fall asleep fast.
sleep is not equal and small portions of sleep dont add up to one long session.
Don't forget exercise, which is great for your sleep hygiene.