There is a standing instruction on most wards that nobody thinks of as a psychological intervention. Turn the patient every two hours, including overnight.
The reason is sound. Immobile patients develop pressure injuries when the weight of their own body cuts off blood supply to skin over bone, and moving them interrupts that. The instruction has saved a great deal of tissue.
It also means that a patient who cannot move themselves is woken, handled and repositioned four or five times between midnight and morning, every night, for as long as they remain immobile. We have built a protocol around the skin and left the sleep out of the calculation.
What fragmented sleep does
Sleep in hospital is already poor. Noise, light, observations, drug rounds and pain all interrupt it. Repositioning adds a scheduled interruption on top of the unscheduled ones, and unlike the others it involves being physically moved.
The consequence is not simply less sleep. It is sleep broken into short blocks, which is a different problem. Slow wave and REM sleep both need uninterrupted time to accumulate. A patient who logs six hours in forty-minute fragments has not had six hours of sleep in any functional sense.
For anyone working in mental health, the downstream picture is familiar. Fragmented sleep is associated with lower mood, reduced tolerance for pain, impaired attention and working memory, and slower emotional regulation. In older hospital patients it is also associated with delirium, though the direction of that relationship is genuinely difficult to untangle: poor sleep may contribute to delirium, delirium certainly disrupts sleep, and the patients most likely to experience both are unwell enough that neither can be isolated cleanly.
I am wary of overstating this. The evidence base is largely observational, and there is no trial that randomises immobile patients to disturbed or undisturbed nights, for obvious reasons. What can be said is that we routinely accept a level of sleep disruption in this population that we would consider unacceptable in almost any other clinical context.
Where the two hours came from
The interval has a weaker evidential foundation than most clinicians assume. It became standard practice through convention, and convention hardened into policy, and policy is now often audited as though the number itself were the finding.
Current guidance is more careful than the practice it produced. The 2025 Guideline from NPIAP, EPUAP and PPPIA, the fourth edition of Prevention and Treatment of Pressure Ulcers/Injuries: Clinical Practice Guideline, is published online chapter by chapter, and repositioning is among the chapters covered. The direction it points is toward individualising frequency to the patient and the surface they are lying on, rather than applying one interval to everyone on the ward.
That distinction matters here. A patient on a high specification surface, at moderate risk, with intact skin, may not need the same schedule as a patient at very high risk with an existing injury. Treating the two identically means one of them is being woken more than their skin requires.
The unspoken trade
Ask ward staff and most will tell you, quietly, that the schedule on paper and the schedule delivered overnight are not identical. Staffing at three in the morning is not staffing at three in the afternoon.
There is a real irony in this. The gap between prescribed and delivered repositioning is a well-recognised patient safety problem, and closing it means more night-time disturbance for the patient, not less. Doing the prevention properly costs sleep. Doing it badly costs skin. Nobody presents it as a trade-off, but that is what it is.
What can actually be changed
Three things are within reach without abandoning prevention.
The first is timing rather than frequency. Clustering necessary care so that repositioning, observations and medication happen in one contact rather than three spreads the same interventions across fewer wakes. This is unglamorous coordination and it is often the largest available gain.
The second is individualising the interval, which the current guidance supports, and documenting the reasoning. A schedule set by risk assessment and skin inspection is defensible. A schedule set by habit is harder to defend in either direction.
The third is reducing how often a human has to enter the room at all. Support surfaces that redistribute or alternate pressure change what the skin experiences without waking anyone. Systems that tilt the patient on a programmed cycle go further, delivering the positional change itself without hands on the body. Neither replaces skin inspection or nutrition or continence care, and any supplier who suggests otherwise should be treated with suspicion. What they change is the number of times a sleeping person has to be handled to keep them safe. There is a fuller account of how that works at abewer.com, and a separate discussion of how the different support surfaces compare.
Why this belongs in a psychology conversation
Pressure injury prevention is filed under tissue viability. Sleep is filed under wellbeing, or under mental health, or under nothing at all when the patient is medically unstable and there are more urgent things to write about.
The result is that the cost lands somewhere nobody owns. Nurses know their patients sleep badly. Psychologists rarely see the repositioning chart. Families notice their relative is confused and low and attribute it to the illness, which it partly is.
None of this argues for turning patients less. It argues for counting sleep as an outcome rather than as an acceptable loss, and for asking, on each individual patient, whether the interval we are using is the one their skin actually needs or simply the one written on the wall.
Those are different questions, and only one of them has been audited.
Amelia Hart, a psychology graduate from the University of Hertfordshire, has a keen interest in the fields of mental health, wellness, and lifestyle.
