Back to: The Science of Well-Being
Sleep scientist Matthew Walker calls sleep ‘a nonnegotiable biological necessity,’ and the research backs the strong language. Sleep deprivation impairs memory formation by as much as 40 percent, weakens the immune system, and amplifies the brain’s emotional reactivity, which is why everything feels worse after a bad night. No well-being habit survives chronic exhaustion.
Two evidence-based rules do most of the work. First, regularity is king: going to bed and waking at the same time every day, weekends included, anchors your body clock and improves both quantity and quality of sleep. Second, keep it cool and dark: your core temperature needs to drop to initiate sleep, so a bedroom around 65°F (18°C) helps most people.
Two more practical upgrades: avoid caffeine within eight to ten hours of bedtime, and if you can’t sleep after about twenty minutes, get up and do something quiet in dim light until sleepy, so your brain keeps associating bed with sleep rather than with tossing. Treat sleep as the infrastructure of your semester: every other course in your life runs on it.