Short answer: build the week around sleep, daily movement, and focused blocks of active study, not around a target number of hours. The most common regret from students who got through is not that they studied too little. It is that they measured study in hours and burned themselves out for material they did not retain.
Start with sleep, it is not the thing you sacrifice
Sleep is where memory consolidation happens. Newly learned material is stabilised and integrated during sleep, and cutting it does measurable damage to your ability to form new memories in the first place (Rasch & Born, 2013; Diekelmann & Born, 2010). One study found that a night of deprivation significantly impaired people's capacity to encode new information the following day (Yoo et al., 2007).
Which means the 2am session is not free extra study. You are borrowing from the process that turns today's study into something you still know in October. Aim for a consistent 7 to 9 hours.
Move every day
Regular physical activity is associated with better cognitive function and brain health, not just general wellbeing (Hillman, Erickson & Kramer, 2008). A walk or a gym session is not an hour stolen from study, it is part of what makes the study hours work.
This is the second big regret: cutting the gym, the walks and the social contact to buy study hours, ending up isolated, and not getting better marks for it. Isolation makes a hard year harder and does not pay you back.
On the "best time to study"
You will see confident claims that early morning, or late evening, is optimal. The honest position is that it depends on the person. Cognitive performance does vary across the day, but it varies with your individual chronotype, and people perform best at their own peak times rather than at a single universally correct hour (Schmidt et al., 2007).
So the practical rule is not "wake at 5am". It is: notice when you actually think clearly, put your hardest active work there, and put admin, rereading logistics and lighter tasks in your trough.
A workable week
- Lectures: attend or watch them, but treat them as input only. Nothing is learned yet at this stage.
- Daily, 20 to 40 minutes: active recall on the last few lectures. Closed notes, produce the answer, check. This is the highest-value block in the week.
- Daily, 10 minutes: clear your flashcard reviews so the queue never becomes a monster.
- Two or three times a week: a longer block of mixed practice questions across topics, done under something like exam conditions.
- Weekly: one session revisiting older material, not just the current week, so earlier content does not quietly decay.
- Every day: movement, real meals, and some contact with people.
The metric to use instead of hours
At the end of a session, ask what you could produce from blank that you could not produce before. If the answer is nothing, the session was probably rereading in disguise, no matter how long it lasted.
If you want practice that forces production rather than recognition, start a paper free on Cutline.
References
- Rasch, B., & Born, J. (2013). About sleep's role in memory. Physiological Reviews, 93(2), 681–766.
- Diekelmann, S., & Born, J. (2010). The memory function of sleep. Nature Reviews Neuroscience, 11(2), 114–126.
- Yoo, S.-S., et al. (2007). A deficit in the ability to form new human memories without sleep. Nature Neuroscience, 10(3), 385–392.
- Hillman, C. H., Erickson, K. I., & Kramer, A. F. (2008). Be smart, exercise your heart. Nature Reviews Neuroscience, 9(1), 58–65.
- Schmidt, C., et al. (2007). A time to think: circadian rhythms in human cognition. Cognitive Neuropsychology, 24(7), 755–789.
