Sleep Better — A Complete Guide to Rest

Most sleep problems start before you get into bed. The room is too warm, too bright, or too noisy. Your body can't manufacture the conditions for deep sleep if the environment is working against it. Every one of these is fixable, and most of the fixes are free.

Temperature

Your core body temperature needs to drop by about 1°C to initiate sleep. The ideal bedroom temperature for most adults is 16–18°C. Warmer than 20°C and sleep quality measurably degrades — you spend less time in deep slow-wave sleep and more time in lighter stages. Open a window before bed, use lighter bedding than you think you need, and if you share a bed with someone who runs warmer, consider separate duvets (the Scandinavian solution, widely adopted for good reason).

Darkness

The human eye can detect light through closed eyelids at levels too low to feel bright. Even a standby LED, a streetlight through thin curtains, or the glow of a phone screen suppresses melatonin production. The goal is complete darkness — if you can see your hand in front of your face, it's too light. Blackout blinds are the highest-return purchase most people make for sleep quality. A sleep mask is a cheaper first step if you rent or don't want to fit blinds.

Noise

Sudden noise — a car alarm, a partner's snoring, a neighbour — causes micro-arousals that fragment sleep even if you don't fully wake. Continuous low-frequency noise (rain, a fan, pink noise) is helpful because it masks sudden changes. You're not trying to eliminate all sound; you're trying to eliminate spikes. Foam earplugs give the highest noise reduction (around 33dB) at almost no cost. A white noise machine or a fan works well if earplugs are uncomfortable.

Your bed

You spend roughly a third of your life in bed. A mattress that causes you to wake with back pain or to overheat isn't a neutral object. A medium-firm mattress suits most people. Memory foam retains heat — a problem if you sleep warm. If your mattress is older than 8–10 years and you wake feeling unrested despite good sleep habits, it's worth considering. Pillows matter too: your head and neck should be in a neutral line with your spine, not tilted up or forward.