Don't study harder tonight.
Sleep first.
I know that sounds like the advice of someone who doesn't understand how much work you have. But Royal Holloway researchers ran two meta-analyses across 50 years of sleep and memory research and found something that should permanently change how you schedule your work.
One full night of sleep deprivation before learning cuts your brain's ability to form new memories by 40%.
Not 5%. Not a slight dip. 40%.
You can spend 4 hours studying after no sleep. Your brain will process almost none of it. The hippocampus, which is the part that actually converts experience into memory, needs sleep to prepare itself for encoding.
You cannot outwork a depleted hippocampus.
The paper: "Sleep Deprivation and Memory: Meta-Analytic Reviews"
Psychological Bulletin, 2021.
The students who stay up all night to study aren't working harder than you.
They're working in a brain that's been locked.
Sleep is not the enemy of productivity. It is the condition that makes productivity possible.