Sleep and recovery
Recovery is where the change happens.
Training, work and stress are the stimulus. Sleep is when the body answers it. Most people put all their effort into the stimulus, leave the answer to chance, and then buy something to make up the difference. This page sets out what is firmly established about sleep, where the recovery market runs ahead of its evidence, and the small number of levers that actually move it.
Written for anyone who has optimised their training and their diet and left the eight hours that everything else depends on entirely to chance.
Where adaptation happens
Not in the session. In the hours after it.
The levers that matter
Light, timing and temperature, in roughly that order.
Worth knowing
A score from a tracker is not the same as sleeping well.
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Mobile, 1080 x 1350 portrait, JPEG q75 under 300KB. Same scene as 09a, recomposed vertically rather than cropped from the landscape file.
01 · The problem
Everyone knows sleep matters. Almost nobody changes anything.
Sleep is the most repeated advice in wellness and the least acted on. Part of that is how it arrives: a list of twelve rules, most of them minor, with no indication of which two matter. Part of it is that a tracker hands you a score in the morning and no instruction about what to do differently tonight.
The rest is that the levers which genuinely work cost something socially. An earlier bedtime, less alcohol in the evening, a consistent wake time that includes Saturday. Those are harder to sell than a supplement, so the market talks about the supplement instead.
Who is writing this
We treated it as spare time too.
We spent a long time treating sleep as the thing that happens when the useful part of the day is over, and wondering why the rest of it was not working. Changing that was less about a device and more about understanding what recovery actually is.
We are not doctors and we do not pretend to be. What we can do is separate what has been tested in people from what has been tested in a dish, say how large and how long the studies were, and tell you plainly where the evidence stops. Where something is genuinely unresolved, we say so rather than picking a side.
How this works
Discover. Understand. Explore. Choose.
The same four steps on every page of this site, in that order. You are somewhere in the middle of them right now.
01
Discover
Find out the question is more interesting than you were told.
02
Understand
See what the evidence supports, and where it runs out.
03
Explore
Ask the person who sent you here to walk you through it.
04
Choose
Decide for yourself, with no pressure and no deadline.
02 · Why it matters
Adaptation happens while you are asleep.
Training does not make you fitter. It makes you temporarily worse, and the repair is what makes you fitter. That repair is concentrated in sleep, alongside memory consolidation, hormone release, immune function and the way the body handles glucose the following day. The stimulus gets the attention because it is the part you can feel.
It also accumulates. A short night is absorbed easily enough. A short fortnight shows up as slower thinking, a worse mood, hungrier afternoons and a higher chance of picking up an injury, and by then most people have attributed all of that to something else entirely.
03 · What the evidence says
Three claims, three very different standards of proof.
Established
Duration, timing and regularity
That most adults need somewhere around seven to nine hours, that restricting sleep measurably degrades attention and glucose handling within days, and that a consistent wake time and morning daylight anchor the body clock, are all well established in people. Structured behavioural treatment for insomnia is the recommended first-line approach and outperforms sleeping tablets over the long run.
Mixed
The room, the wind-down, the supplements
A cooler, darker, quieter room has reasonable support, though the effect sizes are modest and vary by person. Research suggests melatonin is most useful for shifting a body clock, jet lag or a delayed sleep pattern, and much weaker as a general sleeping aid. Magnesium studies are small and mixed. Alcohol is the clearest of the group and the least welcome: it shortens the time to fall asleep and degrades the second half of the night.
Often overstated
Sleep scores and recovery devices
Consumer trackers estimate sleep stages from movement and heart rate. They are reasonable at telling you roughly how long you were asleep and considerably less reliable about which stage you were in. Clinicians have described people whose anxiety about their score is itself keeping them awake. Compression boots, cold exposure and massage devices are mostly measured against how sore people say they feel, which is not the same as performance restored.
This is an area of active research. Some of the studies referenced here are early, small, or conducted in laboratory or animal models rather than in people. We have said so wherever that is the case.
04 · The options
Three routes, in rough order of how much evidence sits behind them. The first two are free and are where nearly all of the available benefit lives. The third is where nearly all of the spending goes.
The two anchors
The same wake time every day, weekends included, and daylight in your eyes reasonably early. Between them these do more for the body clock than anything you can buy, and they work whether or not you get to bed on time.
What it will not do: treat insomnia that needs proper help.
The hour before, and the room
Cooler, darker, quieter. Caffeine earlier than feels necessary, since it lingers far longer than most people assume. Alcohol treated honestly as a sedative rather than a sleep aid. On screens, the light matters less than what the screen keeps you doing.
What it will not do: make up for weeks of short nights.
Measuring, carefully
A tracker is useful for a trend across a month and close to useless as a verdict on last night. If checking the score is the first thing you do in the morning and it sets your mood for the day, the honest advice is to stop wearing it for a while.
What it will not do: tell you your sleep stages accurately.
05 · The limits
When it is not a habit problem.
Some sleep problems are medical and no amount of routine will touch them. Loud snoring with pauses in breathing, waking unrefreshed however long you were in bed, or falling asleep during the day are reasons to see a doctor rather than to buy a pillow. Sleep apnoea is common, frequently missed, and treatable once it is found.
Insomnia that has lasted months also deserves proper help rather than another list of tips, and the recommended treatment is behavioural rather than pharmaceutical. Do not start or stop any sedating medication on the strength of a website. If you work shifts, be aware that most general sleep advice is written for people who do not, and adapting it is a conversation with someone who knows your situation.
Nothing described on this page treats, prevents or cures any condition. A page about recovery that never says where recovery stops is selling something.
What is at stake
A third of your life, run on defaults.
If you understand it
You adjust the few levers that genuinely move sleep, stop chasing the ones that do not, and know when persistent trouble is a reason to see a doctor rather than buy something.
If you do not
More effort poured into training and diet with the one input that governs both left unexamined, and a score from a device standing in for actually feeling better.
Keep reading
There is no rush, and nothing to sign up for.
If this was useful, these three are the natural next reads. Everything is free and nothing asks for your name.
Talk to your consultant to learn more.
The information on this page is for education only. It is not medical advice, and it is not a diagnosis or a treatment. Always speak to your doctor before changing anything about your care, and never stop prescribed medication without medical guidance.