I am a sophomore in high school, and I recently took the SAT. I got a 1970… sadly it is not the score I wanted, although it is a 310 point increase from when I took the SAT last. I really am trying to get a 2400 (like everyone else) and I know that 430 points is a daunting task to try to complete/ achieve. Is there any advice that you could give me? and how reliant are SAT scores on the amount of sleep that you get because I was running on three hours of sleep when I took it (day after prom 
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Everyone will like to get a 2400, but it requires to be nimble on the test. A 2250+ will open the same doors as 2400 so don’t feel bad if you don’t make it. Also the SAT will be completely new for next year.
It is possible. I currently underwent a 250 point increase in my SAT score with 3 weeks of serious prep. I’m retaking it in November and I’m pretty confident of increasing it by a 100 point or so.
If you work hard, you can achieve any target that you set for yourself.
It’s a lot easier to increase from 1700 to a 1900 than to increase from a 2000 to a 2200.
So you’re shooting for a 740 point increase from your first take? It will definitely be challenging. The higher your score gets, the harder it is to improve. A 2400 is especially challenging, and often requires a dash of luck.
It definitely is not a good idea to take any exam sleep-deprived. Zoning out etc. costs you precious time in the SAT. How much it affected you honestly depends on how well you function on low sleep though.
Look up Silverturtle and xiggi’s threads on preparing for the SAT.