Deep work — the kind of concentration that lets you write, build, analyse or design something genuinely good — is surprisingly easy to break. It rarely collapses in one dramatic moment. It goes in small pieces: a notification you glance at, a reply you fire off "just quickly", a tab you open to check one fact and close twenty minutes later.

Nobody plans to lose a morning to skimming. It happens through habits that feel harmless on their own and expensive in combination. Here are ten mistakes that quietly dismantle focus, with a fix for each. You don't need to change all of them at once. Start with the two that sound most familiar.

You start the day reacting instead of deciding

Mistake 1: opening email before you've decided what matters. The inbox is a list of other people's priorities, and it's at its most persuasive first thing. Ten minutes in, you've absorbed three problems that aren't yours to solve today and lost the thread of what you actually sat down to do.

Mistake 2: leaving your best hours available. If your calendar is open from 9am, it will fill. The work that needs a clear head gets pushed to late afternoon, when a clear head is the one thing you don't have.

Fix both with one move: before you open anything, write down the single thing you want finished today. Then protect a block for it — 60 to 90 minutes, early if you can — and treat it like a meeting with someone senior. Put it in the calendar so it looks occupied. The inbox will still be there at 11am.

You multitask on purpose

Mistake 3: "I'll just answer this one thing while I think." That sentence is the sound of a focus block ending. Switching between a demanding task and a light one feels efficient because both are moving, but you pay twice: once when you leave the hard problem, again when you try to get back in.

Mistake 4: using distraction as a reward. Finish a paragraph, check the phone. Finish a row of figures, check the news. If every small win earns a glance somewhere else, your attention never gathers any speed.

Instead of chasing an interruption, write it down. Keep a scrap of paper or a blank note open and add a line: "Reply to Sam about the invoice." The thought stops circling because it's captured, and you can clear the list in one batch later.

Your notifications are still switched on

Mistake 5: keeping alerts on "just in case". Most notifications are not urgent; they're simply loud. "Just in case" describes something that happens a handful of times a year, and you're paying for it several times an hour.

Mistake 6: leaving the phone where you can see it. A phone face up on the desk takes up attention even when it stays silent. You're monitoring it, which means you're not fully anywhere else.

A short audit does most of the work:

• Turn off notifications for everything except calls and messages from the few people who might genuinely need you quickly.
• Remove badge counts and move chat apps off your home screen, so opening them is a decision rather than a reflex.
• During focus blocks, put the phone in a drawer or a bag — out of reach, not just face down.
• Close email and messaging tabs while you work, and open them at set times instead.
• Set a do-not-disturb schedule so it switches on automatically each morning.

Your sessions have no shape

Mistake 7: no clear finish line. "Work on the report" is not a task, it's a mood. Without a defined output — a section drafted, a decision made, five options listed — you drift, and drifting feels like working.

Mistake 8: no start and end ritual. Sessions that begin vaguely and end abruptly leave you unsure whether you've stopped or simply wandered off, which makes it harder to rest properly afterwards.

Give each block a shape: decide the deliverable, set a finishing time, and spend the first five minutes rereading where you left off. Before you stop, write one sentence describing the next step. That sentence gets you back in tomorrow without the usual twenty-minute warm-up.

You fill protected time with shallow work

Mistake 9: clearing admin inside your focus block. The block is in the calendar, the door is shut, and you spend it tidying your task list and replying to a colleague. It feels productive because things are being completed — just not the thing that needed silence.

Keep a separate list for shallow work: anything you could do while half-listening to music, standing in a queue, or in a ten-minute gap. Batch it into one or two windows a day, ideally after your focus block rather than before. When a small task pops into your head mid-session, it goes on that list, not into your hands.

You treat recovery as optional

Mistake 10: pushing through without a break. Skipping lunch, staying at the desk, working straight through the afternoon slump — none of it buys extra output. It usually buys mistakes you'll spend tomorrow correcting.

After a long block, step away properly: stand up, move around, look at something further away than a monitor, drink some water. Eat away from your desk when you can. A ten-minute break that genuinely interrupts the work beats twenty minutes of half-working while telling yourself you're resting. If you're tired all the time despite reasonable sleep, that's worth raising with a GP rather than fixing with another productivity trick.

Pick one change and protect it this week

Reading a list like this can tempt you to rebuild your whole routine on a Monday, which tends to last until Wednesday. Choose one fix instead — the morning decision, the phone in the drawer, the defined finish line — and run it for five working days. Judge it by a simple measure: did the important thing get finished?

Then add the next one. Focus isn't a personality trait you either have or don't; it's the sum of the small conditions you set up around yourself. Improve the conditions slightly, and the deep work follows.