What happens if I only sleep 4 hours a day?

I'm a fresh graduate right out of college I'm 21 years old. I I have an upcoming job starts from 8:00 AM - 5:00 PM. I plan to work another job at night at the BPO industry as a call center agent. shift is from 10:00 PM - 7:00 AM. I can catch sleep at the time frame from 5:30 PM - 9:30. now I'm... show more I'm a fresh graduate right out of college I'm 21 years old. I I have an upcoming job starts from 8:00 AM - 5:00 PM. I plan to work another job at night at the BPO industry as a call center agent. shift is from
10:00 PM - 7:00 AM.

I can catch sleep at the time frame from 5:30 PM - 9:30. now I'm guessing that is heavy but the body adapts to its environment right right?

I'm just wondering if 4 hours is enough, plus I can restructure every saturdays
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