How Do I Know If I'm Getting Enough REM Sleep?

Sleep trackers can be helpful, but they are not perfect.

Many watches, rings, and under-mattress devices estimate sleep stages using movement, heart rate, breathing patterns, and other signals. They can give you a useful overview of your sleep habits, especially when looking at patterns over time. For example, you may notice that your REM estimate drops after alcohol, late nights, stress, or irregular bedtimes.

However, consumer sleep trackers do not measure brain activity in the same way as a clinical sleep study. That means they can make mistakes when identifying REM sleep, deep sleep, and light sleep.

The most accurate way to measure sleep stages is through a professional sleep study, also known as polysomnography. This is usually only needed if a healthcare professional suspects a sleep disorder, such as sleep apnoea, narcolepsy, periodic limb movement disorder, or another condition affecting sleep.

For everyday use, try not to become too attached to the exact REM sleep number on your device. Use it as a guide, not a judgement. How you feel during the day matters too.

There are many reasons why you might not be getting enough REM sleep. Some are lifestyle-related, while others may be medical or linked to medication.

Common causes include:

Because REM sleep often increases in the later part of the night, cutting sleep short can reduce the amount of REM sleep you get. If you regularly sleep for only five or six hours, you may be missing out on some of the richest REM periods of the night.

Even if you spend eight hours in bed, repeated waking can disrupt the sleep cycle. Noise, light, stress, young children, pets, pain, temperature changes, or a restless partner can all fragment sleep.

Alcohol may make you feel sleepy at first, but it can reduce sleep quality and disturb the later stages of sleep. Many people fall asleep quickly after drinking, then wake in the early hours feeling hot, thirsty, anxious, or wide awake.

Caffeine is a stimulant and can stay in the body for several hours. Afternoon or evening caffeine may make it harder to fall asleep, but it can also affect how deeply you sleep once you do drift off.

A busy mind can make it difficult to fall asleep and stay asleep. Stress can also leave the body more alert at night, making sleep feel lighter and less settled.

Nicotine is another stimulant. It can interfere with sleep onset and sleep quality, particularly when used close to bedtime or during the night.

Some medications, including certain antidepressants and pain medications, can affect REM sleep. This does not mean you should stop taking prescribed medication. If you are concerned about your sleep, speak to your GP or pharmacist for advice.

Conditions such as insomnia, sleep apnoea, restless legs syndrome, narcolepsy, and REM sleep behaviour disorder can all affect sleep quality. If you snore loudly, gasp during sleep, wake choking, feel extremely sleepy during the day, or act out dreams, it is important to seek medical advice.

Being too hot or too cold can interrupt sleep. Temperature changes may wake you fully or keep you in lighter sleep for longer. A cool, comfortable bedroom often supports better sleep quality.

REM sleep is closely tied to how well your brain works the next day.

After poor sleep, you may notice that ordinary tasks feel harder. You might re-read the same email several times, lose your train of thought mid-sentence, or feel less able to handle small frustrations. This is not laziness or a lack of discipline. It may simply be your brain asking for better rest.

REM sleep helps the brain process information and emotions. It supports learning, memory, problem-solving, and mood regulation. This is why poor sleep can affect not just your energy levels, but also your patience, confidence, appetite, motivation, and ability to concentrate.

Quality sleep is not a luxury. It is part of how the mind and body stay well.

You cannot force REM sleep to happen on command. What you can do is create a rhythm and environment that gives your body the best chance of moving through the sleep cycle naturally.

Try to go to bed and wake up at roughly the same time each day, including weekends where possible. A regular routine helps support your circadian rhythm, which is your body’s internal clock.

If your bedtime changes dramatically from night to night, your body may struggle to know when to feel sleepy and when to feel alert.

If you need to wake at 7am, going to bed at 1am leaves very little room for a full, restorative night. Aim for a sleep window that allows seven to nine hours, depending on your individual needs.

Remember, REM sleep often becomes longer later in the night. A full night gives your body more opportunities to complete healthy sleep cycles.

A good evening routine does not need to be complicated. It might include dimming the lights, putting your phone away, reading, stretching gently, taking a warm bath, or using calming music.

The aim is to send your body a clear message: the day is done, and it is safe to rest.

If you are sensitive to caffeine, try avoiding it from early afternoon onwards. Coffee, black tea, green tea, cola, energy drinks, and some chocolate can all contain caffeine.

You do not necessarily need to give it up completely. Simply moving your last cup earlier in the day may make a noticeable difference.

A nightcap may feel relaxing, but it can make sleep more broken. If you are trying to improve REM sleep, it may help to limit alcohol, especially in the few hours before bed.

Your sleep environment matters. Keep the bedroom cool, dark, quiet, and comfortable. Choose breathable bedding, supportive pillows, and sleepwear that helps you maintain a comfortable temperature through the night.

Small changes can make a surprisingly big difference. A room that feels calm and inviting can help the body settle more easily.

Natural light in the morning helps regulate your body clock. Even ten to twenty minutes outside can support a healthier sleep-wake rhythm, especially during darker months.

If you work indoors, try stepping outside early in the day or sitting near a bright window.

Regular movement can support better sleep, reduce stress, and help you feel naturally tired by bedtime. This does not need to mean intense workouts. Walking, stretching, yoga, swimming, or gentle strength training can all help.

Try to avoid very vigorous exercise too close to bedtime if it leaves you feeling energised rather than relaxed.

If your mind starts racing the moment your head touches the pillow, try giving your worries a place to go earlier in the evening. Journalling, writing tomorrow’s to-do list, or doing a short breathing exercise can help create a sense of closure.

The goal is not to solve every problem before bed. It is to reassure your brain that it does not need to keep watch all night.

Occasional poor sleep is normal. Everyone has nights where they wake up too often, stay up too late, or feel less refreshed than usual.

However, if poor sleep is affecting your daily life, it is worth speaking to a healthcare professional. This is especially important if you:

• Feel exhausted despite spending enough time in bed
• Snore loudly or stop breathing during sleep
• Wake gasping, choking, or with a dry mouth
• Feel sleepy while driving
• Experience ongoing insomnia
• Act out dreams or move violently during sleep
• Have persistent low mood or anxiety linked to poor sleep
• Depend on alcohol, medication, or other substances to sleep

A GP can help identify whether there may be an underlying sleep disorder, medication issue, or health condition contributing to your symptoms.

So, how do you know if you are getting enough REM sleep?