7 reasons you wake at 3am, and what to do about each one

You don't have a falling-asleep problem. You have a staying-asleep one.

Ask people to describe their sleep problem and most will say they cannot sleep. Ask a second question and the picture usually changes. They fall asleep quickly, sometimes on the sofa before making it upstairs. What they struggle with is staying asleep.

These are different problems with different causes, and they do not respond to the same things. Sleep onset is about winding down. The rest of the night is about staying wound down while the body cycles in and out of lighter stages. One is a doorway. The other is the whole corridor. Almost the entire category is built for the doorway.

What to do Judge anything you try on hours two to seven, not on how fast you drop off. Speed to sleep is the one thing you already have.

Your body surfaces five or six times a night. One of them sticks.

Sleep runs in cycles of roughly ninety minutes, and at the top of each one the body comes close enough to waking that a noise, a temperature change or a full bladder can tip it over. This happens to everyone, several times a night.

Most of those moments are never registered. A sleeper turns over and goes back down without forming a memory of it. The ones that get remembered are the ones where something held them at the surface long enough for thinking to start. Once the mental arithmetic about hours remaining begins, there is a reason to stay awake.

This is why "woke up at 3am" is such a common description and such an inaccurate one. There were five or six wakings. One of them stuck.

What to do Surfacing is not the failure, staying up is. Keep the room dark and cool, and leave the clock unchecked. The arithmetic about hours left is what holds you at the surface.

Most sleep aids sedate. Sedation is not sleep.

A large share of what is sold as sleep support is sedation, not sleep. Sedation performs well at the doorway. It shortens the time to cross the threshold. What it does not reliably do is keep the corridor quiet.

Alcohol is the clearest illustration. It puts most people under quickly and then fragments the second half of the night as it is metabolised. Many people describe a similar shape with antihistamine-based over-the-counter sleep aids: under fast, up in the small hours, heavy in the morning.

Where the difficulty sits in the second half of the night, a product that works harder on the first twenty minutes is not merely unhelpful. It is aimed somewhere else entirely.

What to do If a nightcap or an antihistamine puts you under fast and then wakes you at three, that is the sedation doing exactly what sedation does. Stop treating the doorway.

The magnesium you tried was almost certainly the wrong kind

Magnesium contributes to normal functioning of the nervous system and to the reduction of tiredness and fatigue. It is also the single most common suggestion anyone receives when sleep comes up in conversation, which is precisely why so many people have tried it and concluded it did nothing for them.

In most cases what was tried was magnesium oxide. It is inexpensive, it fills a large proportion of supermarket tablets, and comparatively little of it is absorbed. When the body takes up very little of a mineral, the honest conclusion is not that the mineral is useless. It is that very little of it arrived.

What to do Before writing magnesium off, find out which form you actually took. If the tub is still in the cupboard, the answer is printed on the back of it.

The number on the front of the pack tells you almost nothing

Two products can both display 200mg of magnesium on the front of the pack and behave quite differently. That figure describes elemental magnesium. It says nothing about the proportion that will actually be absorbed.

Magnesium bisglycinate is magnesium bound to glycine, an amino acid. That binding is what makes it gentler on the stomach than oxide, which is also why it tends not to produce the digestive complaints people associate with cheap magnesium tablets.

The ingredients panel on the back is a more useful thing to read than the claim on the front. Where it says oxide, that goes a long way to explaining a disappointing result.

What to do Read the back, not the front. Bisglycinate over oxide, and check the form before you compare the milligrams.

	Magnesium oxide	Magnesium bisglycinate
What it is	Magnesium bound to oxygen	Magnesium bound to glycine
Typically found in	Cheap supermarket tablets	Formulated supplements
Stomach tolerance	Commonly reported complaints	Generally gentler
On the label as	Magnesium oxide	Magnesium bisglycinate

Your night was decided at four in the afternoon

The familiar advice is sound: a consistent bedtime, a dark room, a cool room, fewer screens. It is also almost entirely aimed at the doorway.

What tends to get skipped is that the second half of the night responds to decisions made much earlier in the evening. Caffeine has a half-life of roughly five to six hours, so a four o'clock coffee is still meaningfully present at ten. Late heavy meals, late training sessions and alcohol all tend to show up as fragmentation hours after they have been forgotten about.

A routine that only edits the ten minutes before bed is editing the smallest available window.

What to do Move the caffeine cut-off to early afternoon and keep alcohol, heavy meals and hard training well clear of bedtime. That is where the second half of the night is won or lost.

A routine that only edits the ten minutes before bed is editing the smallest available window.

Your routine was too big to survive the week

The most effective wind-down is rarely the most elaborate one. It is the one still being done six weeks later.

This is the quiet reason a lot of sleep routines never deliver anything. A nine-step protocol gets started on Monday, survives until Thursday, and is abandoned by the following week, after which the conclusion drawn is that nothing works. One step performed at the same time every evening will generally outperform a perfect routine that gets dropped.

The smallest repeatable action, done consistently, is where the returns are.

What to do Pick one step you can do every single night without deciding to, attach it to a time, and let it be boring. Repeatability is the whole mechanism.