Plan a sleep schedule to stay sharp during exam season.
Exam-season sleep planning works backwards from the exam. Sleep inertia means most people need an hour or more between waking and peak cognitive performance, so the wake time is the exam time minus that window, and bedtime follows from the sleep you want. Shifting an established sleep schedule works at roughly fifteen to thirty minutes per night, which is why the adjustment has to start a week or more ahead.
Backward schedule
Target wake = exam start - minutes to alertness / 60; target bedtime = target wake - target sleep hours
Gradual shift
Shift per night = total hours to shift / days available
General guidance only, not medical advice. Persistent sleep problems, eye strain, pain or anxiety should be discussed with a qualified professional.
Roughly fifteen to thirty minutes a night is sustainable. Larger jumps typically fail because you simply lie awake, and the schedule reverts within a day or two.
Rarely. Sleep deprivation impairs recall, reading speed and error-checking, and the marks lost to those usually exceed what an extra late hour of revision adds.