Sleep Hygiene: The Five Things Most Likely Disrupting Your Sleep
Why "Just Relax" Doesn't Work
If you've been told to improve your "sleep hygiene" and pictured a generic list - no screens before bed, drink some chamomile tea - you're not alone in finding that advice a bit thin. Sleep hygiene isn't a vibe. It's a specific set of environmental and behavioural factors that measurably affect how your brain regulates sleep, and most sleep improvement programmes used within the NHS are built around correcting them systematically, not vaguely.
Dr James Mackin, an NHS GP with over 20 years in family medicine, sees disrupted sleep in clinic most days. In his experience, it's rarely one single problem - it's usually two or three of the same five factors stacking on top of each other, going unaddressed because nobody's pointed them out clearly.
The Five Frustrations
These are the five external factors with the strongest evidence behind their effect on your circadian rhythm and your ability to reach deep, restorative sleep.
1. Light. Bright or blue-toned light in the evening - from screens, streetlight, or an unshaded room - suppresses melatonin and actively signals to your brain that it isn't nighttime yet. This isn't just about falling asleep tonight; repeated evening light exposure can gradually shift your whole sleep-wake cycle later. A sleep mask or blackout blind is a small, cheap fix with an outsized effect.
2. Sound. Disruptive noise doesn't just wake you consciously - much of its damage happens below the threshold of full waking, fragmenting the deep sleep you need to feel restored. White, pink, and brown noise have been studied in disruptively noisy clinical settings (intensive care units, cardiac wards) and consistently help listeners fall asleep faster and stay asleep longer by masking irregular external sound.
3. Temperature. Your body needs to drop in core temperature to initiate and maintain sleep - usually by half a degree to a degree and a half Celsius. A room that's too warm makes that harder to achieve. Most sleep research points to somewhere between 16-18°C as the sweet spot, which is a lot cooler than most people's instinct.
4. Your mattress. The evidence here is less about firmness than most people assume - a medium-firm mattress tends to outperform very soft or very firm ones, but the single strongest finding is that any new mattress outperforms an old one. If yours is pushing 10 years old and you're waking uncomfortable, that's worth acting on before anything else.
5. Clutter. This one often surprises people, but there's a real evidence base for it: a disorganised bedroom measurably raises stress and anxiety, independent of whether you consciously notice the mess. Tidying isn't just a productivity habit - it's also a valuable sleep intervention.
Habits Worth a Second Look
Alongside the environment, a handful of everyday habits quietly undermine sleep even when they don't feel like they do:
Caffeine stays active in your system far longer than most people realise - roughly a quarter of what you drink is still present 10-12 hours later, longer if you're on certain medications.
Alcohol may help you fall asleep faster, but it fragments sleep later in the night and reduces the deep, restorative stages you actually need.
Screens in bed don't just delay sleep with blue light - the scroll-to-the-next-thing design of most apps is built to keep you engaged well past when you meant to put the phone down.
A Word From Dr Mackin
"Patients often come in expecting me to prescribe something. Most of the time, the more useful conversation is about their bedroom; the temperature, the light, what else is in the bedroom. It's not as exciting as a tablet, but it works, and it doesn't come with side effects." Dr James Mackin, NHS GP
Where to Start
You don't need to fix all five frustrations at once. Pick the one that sounds most like your situation, make that change this week, and build from there. Most people find that ranking them by cost - cheapest and easiest first - makes the whole thing far less daunting.
For the complete picture, including the habits, mindset shifts, and relaxation techniques that go alongside your environment, the SoundSleeper app walks through this in more depth, with sound designed to help mask the disruptions you can't remove entirely.
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Sleep hygiene is one part of a complete evidence-based approach to insomnia. For the full picture - including circadian rhythm science, medical causes of poor sleep, and cognitive strategies - read Dr Mackin's complete guide, Restore Your Sleep.