I'd rather not think about what this kind of a schedule will do to my body eventually, it's certainly not healthy
Well I spent a decade working like a slave in a gold mine (i.e. 2-4 hours of sleep a night with binge sleeping some weekends). Your 20's are a good time for that if unmarried and childless.
Lots of folks here are sleeping 4 hours or even less. That is bad folks.
What will that do? It takes time off of your life (yes, so does sleeping). Your body will age poorly and increases onset of major health issues earlier.
Certainly increases likelihood of heart attacks. See lots of Type A personalities with heart problems by mid 30's.
The issue is simply, while sleeping, your body cleans up and regenerates. Failure to allow the body to do this means more toxins in the body and more damaged cells lingering.
Sleep hacking is what some of you need. At minimum, start taking a nap or two during the work day. 20 minutes can do wonders, if you can calm down.
If you are self employed there are a few varieties of sleep hacking that involve a period of 4 hour awake, then a 45 minute sleep. There are different varieties of this sleep schedule and some claim it works once use to such. Unsure if anyone on the planet has adhered to such for more than a few years tops.
No matter what you do, when sleep deprived, do your best for proper hygiene and proper nutrition including nutrient supplementation as needed.