There is a specific kind of tired that does not come from doing anything. It comes from a whole day spent with one ear cocked toward the next message. Not answering, most of the time. Just listening for it. The phone stays face down on the desk, or in a pocket, and some quiet part of you stays turned toward it anyway, ready. By six the day is done and you are worn in a way the actual tasks do not account for. Nothing dramatic happened. That is almost the point.

MoMo hears this described often, usually without a clean name for it. Not screen time, exactly, because the screen was mostly dark. Closer to a hum. A low readiness that never quite switched off, running underneath the meetings and the school pickup and the dinner, all day.

The research has a name for the hum. It is worth knowing, because naming it changes what it looks like.

It has a name, and it is not screen time

The construct is called telepressure: the preoccupation with, and the urge to respond quickly to, message-based communication. Two things are important in the definition. It is a felt pull, not a count of hours. And it has been validated as its own thing, measurable and distinct from how much you actually use your devices.[1][2]

That distinction matters more than it sounds. It means the fatigue is not really tracking the volume of messages, or the minutes on the phone. Two people can get the same number of emails and carry a completely different weight, because the weight is in the reaching-toward, not in the inbox itself.

And the reaching-toward has a documented cost. In a sample followed over a month, higher telepressure predicted more burnout, more stress, and poorer sleep later on, not just a bad mood on the same afternoon.[1][3] It has since turned up across quite different working lives: hospital nurses, university staff, physicians in training.[4][5][7] Different jobs, same texture.

The cost is the failing to switch off, not the time on the device

Here is the part the research is unusually clear about, and it reframes everything.

When people looked for what actually carries the damage from telepressure to a worse life outside work, it was not the device time. It was the failure to recover. The inability to psychologically detach from work, to feel off when you are off. Across independent samples, that impaired detachment is the mechanism doing the harm.[2][3] The phone is not injuring you by being used. It is injuring you by keeping a channel open that never fully closes, so the part of the day that was supposed to be recovery never fully counts as recovery.

Which is why the standby state can be so tiring even on a quiet day. The system was never asked to do much. It was only asked to stay ready. And staying ready, all day, every day, is its own kind of load.

There is a modest but striking finding underneath this. One cross-sectional study of hospital nurses looked at the expectation of needing to be reachable in private life, and found it was associated with more cognitive lapses during work: the small forgettings, the losing-the-thread. What sharpened the effect was simply having the phone within physical reach, in a pocket, whether or not it was actually used.[4] It is one study, in one profession, so hold it lightly. But it points at something many people recognise. The device does not have to ring to occupy you. Its mere presence, and the expectation attached to it, seems to take up room.

Why it does not stay at the office

The obvious hope is that this ends when the workday does. For a lot of people it does not, and the research suggests why.

Telepressure tends to travel with weaker boundary-setting around technology, and with a pull toward overwork.[5] The reachability does not respect the edge of the workday because the person carrying it has, understandably, stopped being able to draw that edge cleanly. And the fix that was supposed to help can quietly make it worse. A three-wave study found that flexible, work-from-anywhere arrangements only reduced work-life conflict for people who already had low telepressure. For everyone else, working from anywhere just meant being reachable from everywhere.[6] The flexibility did not lower the hum. It extended its range.

This is adjacent to something MoMo has written about before, in "The invisible in-basket," about carrying an unbounded queue of small tasks that never shows up as work. This is a cousin of that: not the volume of the queue, but the state of standing ready for it, all the time.

Not a willpower problem

The instinct, once you notice this in yourself, is to make a rule. Check less. Batch the messages. Turn off the badge. And those are not bad ideas. But if the story so far is right, they treat this as a discipline problem, and the discipline framing keeps locating the fault in the person who is already the most stretched.

The research keeps pointing somewhere else. It puts the harm in the failure to detach, and detachment is not mainly a matter of how strong-willed you are. In fact, one of the three linked studies found that organisational supports, the things a workplace does to lower the pressure, buffered the effect.[3] Which is a quiet way of saying this was never purely a private failing to fix with more grip. It is partly built into the expectations around you.

There is a night version of this loop, the evening reach for the phone at the edge of sleep, which we looked at separately in "The loop that keeps the light on." This is the daytime one. Different hour, different mechanism, same underlying truth: the reaching is usually a readout of the load, not the cause of it.

You do not have to do anything with this. No audit of your notifications, no new rule to keep or break. But the next time a quiet day leaves you strangely emptied out, with nothing on the list to blame it on, it might be worth knowing that being on standby is itself a documented cost. The tiredness is not evidence that you handled the day badly. It is evidence that you spent it half-turned toward a channel that never closed.

Noticing that a flat, worn-out evening connects back to a whole day spent reachable, so the fatigue reads as a load you carried rather than a fault in how you carried it, is the kind of continuity MoMo was built to hold. But that is a footnote. The essay is the hum, and what it quietly costs to stay ready all day.

References

Barber, L. K., & Santuzzi, A. M. (2017). Telepressure and college student employment: The costs of staying connected across social contexts. Stress and Health, 33(1), 14–23. PMID: 26833698.
Barber, L. K., Conlin, A. L., & Santuzzi, A. M. (2019). Workplace telepressure and work-life balance outcomes: The role of work recovery experiences. Stress and Health, 35(3), 350–362. PMID: 30882979.
Pfaffinger, K. F., Reif, J. A. M., & Spieß, E. (2022). When and why telepressure and technostress creators impair employee well-being. International Journal of Occupational Safety and Ergonomics, 28(2), 958–973. PMID: 33164707.
Cambier, R., Van Laethem, M., & Vlerick, P. (2020). Private life telepressure and workplace cognitive failure among hospital nurses: The moderating role of mobile phone presence. Journal of Advanced Nursing, 76(10), 2618–2626. PMID: 32803902.
Wilder, E., Aziz, S., & Wuensch, K. (2024). Working 9 to always: relationships among workplace telepressure, ICT boundary creation, and workaholism. Health Psychology Reports, 12(3), 227–237. PMID: 39234022.
Hong, J., & Jex, S. (2022). The conditions of successful telework: Exploring the role of telepressure. International Journal of Environmental Research and Public Health, 19(17), 10634. PMID: 36078350.
Levy, B. E., Stephens, W. A., Charak, G., Buckley, A. N., Ortega, C., & Patel, J. A. (2024). Assessing the prevalence of workplace telepressure on resident and attending physicians: A validated scale. Surgical Open Science, 20, 123–127. PMID: 39036037.