Originally published: January 16, 2025, Updated: September 2, 2026
You cannot force yourself to fall asleep. In fact, trying too hard often has the opposite effect.
Sleep begins when several things happen at the right time: your body temperature starts to fall, your internal clock recognises that night is approaching and enough sleep pressure has built up during the day. This is why tricks such as counting sheep rarely solve the real problem.
If you are wondering how to fall asleep quickly or what to do when you cannot sleep, it is more useful to work with the systems that regulate sleep rather than trying to switch your brain off on command.
Here is what actually matters.
Your body falls asleep more easily when its core temperature begins to decrease.
A bedroom temperature of around 16–19°C works well for many adults. The room should feel comfortably cool rather than cold. Heavy bedding, an overheated bedroom or poor ventilation can make it more difficult for the body to release heat.
Interestingly, warming yourself before bed can also help.
A warm shower or bath about 1–2 hours before bedtime warms the skin and increases blood flow to the hands and feet. Afterwards, the body can release heat more efficiently, supporting the natural drop in core temperature associated with sleep.
You do not need an elaborate evening ritual. A warm shower followed by a cool, quiet bedroom is often enough to send a much clearer signal to the body than simply lying down and hoping to become sleepy.
Light is one of the strongest signals controlling your internal body clock.
In the evening, bright light can tell your brain that the day is still continuing. Blue-enriched light from phones, laptops, televisions and bright indoor lighting is particularly relevant because it can interfere with the evening rise of melatonin and shift the sleep-wake rhythm later.
This does not mean that one look at your phone will ruin your sleep. It means that your overall light environment matters.
During the final hour before bed, lower the intensity of the lights around you where possible. If you use a screen, reduce its brightness and avoid spending the last moments of the day under strong overhead lighting.
Morning light is just as important.
Try to get natural daylight within approximately 30 minutes of waking up, particularly if you regularly struggle to become sleepy at the right time in the evening. Morning light gives the circadian system a strong signal that the day has begun and helps reinforce the timing of the following night.
In simple terms: brighter mornings and darker evenings make it easier for your body to understand when it should be awake and when it should prepare for sleep.
A consistent wake-up time is often more useful than forcing yourself to go to bed at exactly the same time every night.
Your body cannot be commanded to sleep at 10:30 PM simply because the clock says so. Going to bed before you are sleepy can instead create a long period of wakefulness in bed.
Wake-up time is easier to control.
Choose a realistic time and try to keep it relatively stable throughout the week, including weekends. Regular waking helps anchor your circadian rhythm and influences when sleepiness develops later in the day.
Then let bedtime respond to genuine sleepiness.
If you normally wake at 7:00 AM, repeatedly sleeping until 10:00 or 11:00 AM at the weekend shifts that rhythm. Monday evening may then feel surprisingly early to your body, even if you want to sleep.
Consistency does not have to mean perfection. What matters is giving your body a reasonably predictable rhythm.
Staying in bed and fighting with sleep can teach your brain that the bed is a place for frustration, thinking and clock-watching.
If you feel that you have been awake for roughly 20 minutes, get up.
Do not obsessively watch the clock. Twenty minutes is an approximate guideline rather than a countdown.
Move to another room or sit somewhere away from the bed. Keep the light low and choose something quiet and unstimulating, such as reading a few pages of a book or listening to calm audio.
Return to bed when you feel sleepy again.
If necessary, repeat the process.
This technique is known as stimulus control and is also used within cognitive behavioural therapy for insomnia, or CBT-I. The goal is to rebuild a simple association: bed means sleep, rather than bed means lying awake and worrying about sleep.
Caffeine lasts considerably longer than the initial feeling of alertness.
Its average half-life in adults is around 5 hours, although the exact rate varies from person to person. That means that roughly half of the caffeine from a 4:00 PM coffee may still be in your system around 9:00 or 10:00 PM.
For some people, its effects last considerably longer.
Caffeine also appears in more than coffee. Tea, cola, energy drinks, chocolate and some medications can all contribute to your total intake.
If falling asleep is difficult, try moving your final caffeine of the day earlier. A useful experiment is to avoid significant caffeine for at least 6 hours before bedtime and see whether your sleep changes.
Someone going to bed at 11:00 PM, for example, may want to make 5:00 PM the absolute latest cut-off, and considerably earlier if they know they are sensitive to caffeine.
The important point is that feeling capable of falling asleep after an evening coffee does not necessarily mean the caffeine has left your system.
The harder you monitor sleep, the more difficult sleep can become.
Questions such as “Why am I still awake?”, “How many hours do I have left?” or “How am I going to function tomorrow?” increase mental activity at exactly the moment when you want it to decrease.
Instead of making “fall asleep now” the goal, make the environment restful.
Lower the lights. Put work away. Avoid repeatedly checking the time. Read, listen to something quiet or simply rest until sleepiness appears.
Sleep is a biological process, not a task that becomes easier with greater effort.
And if your mind is particularly active at night, it can help to deal with unfinished thoughts before getting into bed. Write tomorrow's tasks down, make the decision you keep rehearsing or put the thought somewhere outside your head.
The aim is not to empty your mind completely. It is simply to stop giving it new problems to solve.
A bed or mattress cannot correct an irregular circadian rhythm, remove caffeine from your bloodstream or replace treatment for chronic insomnia.
They can, however, remove unnecessary physical obstacles to sleep.
Your sleeping surface should allow you to remain comfortable without frequent pressure, pain, excessive heat, movement or noise. A stable bed frame and a mattress suited to your body and preferred sleeping position can make it easier to stay comfortable once you are ready to sleep.
If you regularly wake because of discomfort, noise from the bed or inadequate support, the sleeping environment is worth examining. Our guide to choosing the right solid wood bed explains what to consider when comparing bed constructions and designs.
The position of the bed can also influence light, noise, airflow and the overall feeling of the bedroom. Read our guide on how to place a bed correctly for practical bedroom layout considerations.
The objective is simple: once your body is ready to sleep, the bedroom should give it as few reasons as possible to wake up again.
Occasional difficulty falling asleep is common. Persistent insomnia is different.
If problems falling asleep or staying asleep happen at least three times a week for three months or longer, particularly when they affect your energy, concentration or functioning during the day, speak to a healthcare professional.
For chronic insomnia, cognitive behavioural therapy for insomnia, known as CBT-I, is widely recommended as a first-line treatment. It addresses the behaviours and thought patterns that can maintain insomnia over time rather than relying only on general sleep-hygiene advice.
The most useful starting point is not searching for one trick that makes you fall asleep instantly. It is creating the conditions that allow sleep to happen naturally and repeating them consistently.
You cannot reliably force sleep when your body is not ready for it. Instead of going to bed simply because it is a certain time, keep a consistent wake-up time, reduce bright light in the evening and wait until you feel genuinely sleepy before getting into bed.
Get out of bed and do something quiet in dim light until you feel sleepy again. Then return to bed. Avoid watching the clock closely because the 20-minute rule is only an approximate guideline.
A cool bedroom of approximately 16–19°C is comfortable for many adults and supports the natural decrease in body temperature associated with sleep. Personal preference, bedding and clothing also influence the ideal temperature.
Caffeine has an average half-life of around 5 hours, and research has found that significant doses can still disturb sleep when consumed 6 hours before bedtime. If you struggle to fall asleep, moving your last coffee to the early afternoon is a useful experiment.
No. A mattress cannot treat insomnia caused by circadian timing, stress, behavioural patterns or other health conditions. A suitable mattress and stable bed can reduce discomfort, pressure and physical disturbances that might otherwise make it harder to fall asleep or stay asleep.
