Joseph Murphy and “sleep on it”: what sleep research confirms

What Murphy’s sleep chapters say

Chapter 13, “Your Subconscious and the Wonders of Sleep”, makes three claims. First, sleep is essential: Murphy says you need eight hours and draws on the sleep-loss experiments of his day, which reported brief involuntary micro-sleeps in people kept awake. Second, the mind does not switch off at night: “Your subconscious never sleeps. It is always on the job.” Third, a request made before sleep is answered, often on waking. One of his subheads is three words long: “Sleep brings counsel.”

His method is a short prayer, repeated “over and over again as a lullaby” as you fall asleep, asking for the right decision, followed by attention to the first impression in the morning. He tells of a radio listener who did this before turning down a job in New York and later learned that the company had failed.

He goes further than decisions. He writes that dreams can warn of future events, describing his own dream, three years before Pearl Harbor, that made him cancel a trip to Asia, and he cites Dr. Rhine of Duke University, the parapsychologist J. B. Rhine, as having gathered evidence of such foresight. Chapter 12, “Scientists Use the Subconscious Mind”, adds stories of discoveries said to have come in sleep.

Murphy’s famous examples, checked

Murphy’s examples are stories, retold from memory, clippings and biographies. Two of them can be checked against better records, and neither happened quite as he tells it.

What the lab shows: sleep and hidden solutions

The best-known test is Ullrich Wagner, Jan Born and colleagues’ 2004 study in Nature. People practised a number task that hides a shortcut, a rule that makes it much faster once you see it. After a night of sleep, “more than twice as many subjects gained insight into the hidden rule” as after the same time awake, whatever the time of day.

The detail that matters most for Murphy’s claim is the control group: “Sleep did not enhance insight in the absence of initial training.” Sleep helped people find a solution they had been working towards. It did not hand out answers to a problem they had never touched. Agassiz’s two weeks on the fossil, in the story Murphy quotes, fit this pattern better than the idea of an answer from nowhere. Banting’s case is not a sleep story in the archive’s account: after preparing a talk on the pancreas and reading Barron’s article, he could not get to sleep, and got up to write the idea down.

In 2021, Célia Lacaux, Delphine Oudiette and colleagues in Paris looked at the edge of sleep. 103 people practised the same kind of task, then took a 20-minute rest break under polysomnography (EEG sleep recording). The 87 who had not yet found the rule were grouped by the deepest stage they reached. Spending at least 15 seconds in the first, lightest stage of sleep (N1) “tripled the chance to discover the hidden rule”: 83% against 30% for those who stayed awake (20 of 24 people against 15 of 49). The advantage vanished in those who slipped into deeper sleep.

These are lab tasks with a single hidden rule, in small groups. Insight here means discovering that rule, not solving a life decision. The Paris study grouped people by how they happened to sleep rather than assigning them at random, and it recruited only people who fall asleep easily, asked to sleep less than usual the night before. Read the results as evidence that sleep and drowsiness can help a mind that has done the work, not as proof that any question is answered overnight.

Can you steer what you dream about?

A little, it seems. In a 2020 study of what they call targeted dream incubation, Adam Haar Horowitz, Robert Stickgold and colleagues used a wearable device that played a short spoken cue (“remember to think of a tree”) to 49 people, 25 of whom were allowed to fall asleep, then woke them for reports. With the cue, 67% of the sleep group’s reports mentioned a tree, against 3% without it. People who stayed awake and heard the cue mentioned a tree in 52% of reports, a difference from the sleep group that was not statistically significant.

The authors list their own limits: a single cue, a homogeneous university sample, no polysomnography (sleep onset was judged partly from people’s own reports) and the risk that people reported what they thought was expected. The study shows that the start of sleep can take up a theme you give it, but not that sleep onset does this better than quiet waking. It does not show that dreams solve problems or carry messages.

What holds and what does not

Set side by side, Murphy’s sleep chapter is partly ahead of its time and partly a matter of faith. The verdicts below are ours, from the studies above.

How to sleep on a question tonight

The research suggests an order: work first, then sleep, then catch what comes. Murphy’s lullaby-like repetition fits the last minutes, as long as it stays light: bring the question to mind once or twice, then let it drift, without trying to push it away either. In Daniel Wegner’s thought-suppression studies (1987), people asked not to think of a white bear for five minutes kept thinking of it, and once the ban was lifted they thought of it more than people who had been asked to think of it from the start, a rebound effect.

Dream Architect’s night ritual is built for a different question. It has you picture one moment of a life you want, not a problem to solve, and its last step is literally called “Sleep on it”: “I close my eyes” opens a dark screen where you relive the moment once, and “Tomorrow night, the same moment?” waits below, already set to yes. The full flow has 7 steps and the quick flow 3 (The moment, The feeling, Sleep on it), counted from the app’s content on 20 October 2026.

If you are carrying a real question, keep it separate. Write it on paper before the ritual, the way Agassiz left a pencil by his bed, and use the morning check-in’s line, “What did you notice this morning?”, to note what you woke up with.

• During the day: give the question real attention, even 15 minutes of working on it.
• Before bed: write it as one line, on paper by the bed.
• Drifting off: hold it lightly, once or twice, then let it go.
• On waking: write the first thing that comes, before checking your phone.

Questions people ask next