Why Am I Not Sleeping Properly? Causes, Signals and What To Do

By Dr. Sajeev Nair, Founder, Vieroots

If you are reading this at 1 AM, having tried for two hours to fall asleep, here is the short version. Poor sleep is almost never a random event. It is usually your body signalling that something else is out of balance, and there are seven common causes that account for the majority of cases. Some are easy to change this week. Others need measurement to identify properly.

This guide covers what poor sleep actually looks like, the seven causes worth investigating, the signs that mean you should see a doctor, and how to work out which cause is yours instead of guessing.

Key points

Sleep problems usually have an identifiable cause, they are rarely just bad luck
The pattern of your sleep problem, trouble falling asleep versus waking at 3 AM, points toward different causes
Stress, blood sugar, nutrient status, light exposure, gut health and genetics are the most common contributors
Feeling unrefreshed after enough hours is a different problem from not getting enough hours
Some sleep problems, particularly loud snoring with pauses in breathing, need medical attention rather than lifestyle changes
Testing removes the guesswork about which cause applies to you

What poor sleep actually looks like

"Not sleeping properly" describes at least four different experiences, and they point in different directions. Finding your pattern is the first useful step.

Your pattern	What it often points toward
You take more than 30 minutes to fall asleep	An active stress response, late screen exposure, caffeine timing, an irregular body clock
You fall asleep easily but wake at 2 to 4 AM	Blood sugar dips overnight, a cortisol rhythm that has shifted, alcohol, sometimes an early sign of low mood
You wake much earlier than intended and cannot return to sleep	Persistent stress, low mood, an advanced body clock, sometimes age-related change
You sleep 7 to 8 hours but wake unrefreshed	Poor sleep quality rather than quantity, possible breathing disruption, nutrient gaps, low iron or vitamin D, an untreated stress load

If more than one applies, that is common. Most people have a mixed picture.

Seven common reasons behind poor sleep

1. Stress and a cortisol rhythm that has shifted

Cortisol is meant to follow a curve. High in the morning to wake you, falling steadily through the day so that by night it is low enough to let you sleep.

Under sustained stress that curve flattens or shifts. The consequence is the very recognisable state of being exhausted but unable to switch off, or waking at 3 AM with your mind immediately busy.

How you would recognise it: lying awake with a racing mind, waking in the early hours, feeling wired in the evening, and often craving sugar or salt at night.

What can be measured: heart rate variability tracked over time is a more useful indicator than a single cortisol blood test, which only captures one moment. Genetic factors influencing stress response can also be examined.

What tends to help: morning daylight exposure within an hour of waking, consistent wake times including at weekends, and a genuine wind-down period rather than working until the moment you lie down.

2. Blood sugar swings during the night

If you eat a carbohydrate-heavy dinner, particularly late, blood sugar rises and then falls. In some people that fall overnight is enough to trigger a stress response, and waking follows.

This is one reason the 3 AM waking is so common in India, where dinner is often eaten late and is frequently rice or roti heavy.

How you would recognise it: waking at a similar time most nights, sometimes feeling warm, hungry, or with your heart beating faster. Often accompanied by daytime signs such as an afternoon energy dip.

What can be measured: fasting glucose, HbA1c and fasting insulin. Genetic factors associated with carbohydrate handling can also be assessed through a geno-metabolic analysis.

What tends to help: eating dinner earlier, including protein and vegetables alongside carbohydrates, and a short walk after the evening meal.

You can read more in our guide to insulin resistance symptoms.

3. Nutrient gaps, particularly magnesium and vitamin D

Several nutrients are involved in the pathways that regulate sleep. Magnesium contributes to muscle relaxation and to the nervous system's ability to settle. Vitamin D deficiency is widespread across India, including in regions with plenty of sunshine, and low levels have been associated in research with poorer sleep quality. Low iron stores are strongly associated with restless legs, which disturbs sleep without the person always realising why.

How you would recognise it: night-time muscle cramps, restless legs, waking unrefreshed despite adequate hours, general daytime fatigue.

What can be measured: a blood panel including vitamin D, ferritin, vitamin B12 and magnesium.

What tends to help: correcting a confirmed gap. This is a case where measuring first genuinely matters, because supplementing without knowing is guesswork.

4. Light, screens and a body clock out of sync

Your body clock takes its main cue from light. Bright light in the evening, particularly from a phone held close to the face, delays the natural rise of melatonin. Insufficient bright light in the morning weakens the signal that should anchor the whole rhythm.

For anyone working late shifts, travelling across time zones, or on video calls with other countries, this is often the largest single factor.

How you would recognise it: you feel most alert at night, mornings are consistently difficult, and your sleep timing drifts later when you have no fixed schedule.

What tends to help: 10 to 20 minutes of outdoor daylight in the morning, dimming lights after sunset, and keeping the phone out of the bedroom. Morning light is the most underused sleep intervention there is, and it costs nothing.

5. Caffeine, alcohol and late dinners

Caffeine has a half-life of roughly five to six hours in most adults, which means a 4 PM coffee can still be measurably active at bedtime. Genetic variation matters here: some people clear caffeine quickly, others very slowly, and slow metabolisers often do not realise that their afternoon tea is the reason.

Alcohol shortens the time to fall asleep and then disrupts the second half of the night, which is why a drink in the evening frequently produces a 3 AM waking.

What tends to help: no caffeine after midday if you are a slow metaboliser, and treating alcohol as something that borrows from tomorrow's sleep.

6. Gut health and the gut-brain relationship

The gut and the brain communicate continuously. Gut bacteria are involved in producing and regulating compounds that influence mood and sleep. Research increasingly links the composition of gut bacteria with sleep quality, though this is an evolving field and the picture is not yet complete.

Practically, many people notice that periods of digestive trouble and periods of poor sleep arrive together.

How you would recognise it: bloating, irregular digestion or acidity alongside your sleep problem, particularly if both worsen during stressful periods.

What can be measured: a gut microbiome test shows the diversity and balance of your gut bacteria.

You can read more in our guide to gut health and bloating.

7. Your genetics

Some people are genuinely built to sleep and wake earlier, and some later. Genetic variation influences chronotype, caffeine clearance, melatonin regulation and stress reactivity.

This does not mean your sleep is fixed by your genes. It means that fighting your own biology, for example forcing a natural night owl into 5 AM workouts, tends to fail, while working with it tends to succeed.

What can be measured: genetic analysis can identify factors associated with sleep timing, caffeine metabolism and stress response.

When to see a doctor

Some sleep problems are medical, and no amount of lifestyle adjustment will resolve them. Please see a doctor if you experience any of the following.

Loud snoring with pauses in breathing, or waking gasping or choking. This can indicate sleep apnoea, which is common, frequently undiagnosed in India, and important to assess properly
Severe daytime sleepiness, particularly falling asleep while driving or in meetings
Chest discomfort, palpitations or breathlessness at night
Sleep problems alongside persistent low mood, loss of interest or hopelessness lasting more than two weeks
Acting out dreams physically, or significant movement during sleep
Any sleep problem that has persisted for more than a month despite reasonable changes

If you are having thoughts of harming yourself, please speak to a doctor or a mental health helpline immediately. This is not something to manage alone.

How to find out which cause applies to you

Here is the difficulty with sleep advice generally. Every article, including this one, lists causes. None of them can tell you which one is yours. So most people try everything at once, cannot tell what helped, and give up.

Measurement replaces that guesswork.

What your genetics can show. A DNA-based analysis such as EPLIMO can identify factors associated with your natural sleep timing, how quickly you clear caffeine, how your body regulates stress hormones, and which nutrients you may need more of than average. This is stable information, so you learn it once and it stays relevant.

What your blood markers can show. Vitamin D, ferritin, B12, thyroid function, fasting glucose and HbA1c between them cover several of the most common physical contributors to poor sleep. This is current status rather than tendency, which is why it complements genetic insight rather than duplicating it.

What your gut can show. A gut microbiome test shows the diversity and balance of your gut bacteria, which is relevant if your sleep problems arrive alongside digestive symptoms.

What daily tracking adds. Genetics tells you your tendency. Blood markers tell you your current state. Neither tells you what happened last Tuesday. Tracking sleep, heart rate variability, meal timing and stress day by day is what connects the two, and it is the part most people skip. TRIGR, the Vieroots AI health coach, is built for exactly this.

Put together, these move you from "I have tried everything" to "I know which two things actually matter for me".

Nine things you can try this week

None of these require buying anything.

Get outdoors within an hour of waking, for 10 to 20 minutes, without sunglasses. This is the single most effective free change available.
Fix your wake time, not your bedtime. A consistent wake time, including weekends, anchors the whole rhythm. Bedtime then follows on its own.
Stop caffeine by midday for two weeks and see what changes. If you are a slow metaboliser, the difference is often striking.
Eat dinner earlier, and include protein and vegetables rather than carbohydrates alone.
Walk for 10 minutes after dinner. It supports digestion and blood sugar regulation, both of which affect the night ahead.
Keep the bedroom cool and properly dark. Body temperature needs to fall for sleep to begin, which matters a great deal in most Indian climates.
Charge your phone outside the bedroom. If you use it as an alarm, buy a clock.
Give yourself a 30 minute buffer between finishing work and getting into bed. Your nervous system does not have a switch.
Write tomorrow's worries down before bed. Externalising the list genuinely reduces the 3 AM mental replay for many people.

Give these two to three weeks. Sleep patterns do not change overnight, and expecting them to is itself a source of stress.

How Vieroots approaches sleep

The Vieroots approach follows the same order every time: understand the cause first, then act on it.

Step one, understand. EPLIMO genetic analysis identifies factors associated with your sleep timing, caffeine handling, stress response and nutrient needs. Blood marker review shows your current status. A gut microbiome test adds the digestive picture where it is relevant.

Step two, personalise. A Vieroots wellness expert interprets the results with you and builds a plan around what your data actually shows, rather than a generic sleep hygiene checklist.

Step three, support. Where a specific gap exists, targeted support may help. Super Magnesium may support muscle relaxation and sleep quality. The Stress and Sleep Stack combines complementary support for people whose sleep problems are stress-driven. These are chosen based on your results, not applied to everyone.

Step four, track and adjust. Sleep Reset 30 is a structured 30-day programme, and TRIGR provides daily coaching so you can see which changes are actually working for you.

Frequently asked questions

Why do I wake up at 3 AM every night? The most common contributors are an overnight blood sugar dip, a shifted cortisol rhythm, and alcohol in the evening. If it happens most nights at a similar time and you feel alert rather than groggy on waking, a stress or blood sugar pattern is the most likely explanation. Persistent early waking alongside low mood is worth discussing with a doctor.

How many hours of sleep do I actually need? Most adults need between seven and nine hours, and the right number within that range varies by individual. A more useful test than counting hours is how you feel at 11 AM on a normal working day. Genuine short sleepers who thrive on five to six hours exist, but they are rare, and most people who believe they are one are simply used to being tired.

Does magnesium help with sleep? Magnesium is involved in muscle relaxation and nervous system regulation, and some research suggests it may support sleep quality, particularly in people whose intake is low. It is not a sedative and it will not override an untreated cause. It tends to be most useful when a genuine gap exists, which is why testing before supplementing is sensible.

Why do I feel tired even after eight hours of sleep? Hours are not the same as quality. Common explanations include disrupted breathing during sleep, low iron or vitamin D, thyroid changes, alcohol, and fragmented sleep you do not remember. Persistent unrefreshing sleep despite adequate hours is worth investigating with a doctor, particularly if you snore.

Is it normal to take 30 minutes to fall asleep? Falling asleep in 10 to 20 minutes is typical. Consistently taking longer than 30 minutes, several nights a week, over a period of weeks, suggests something is keeping your nervous system alert. Look first at light exposure, caffeine timing and the hour before bed.

Can my genetics affect how I sleep? Yes. Genetic variation influences your natural sleep timing, how quickly you clear caffeine, and how strongly you respond to stress. This does not fix your sleep in place, but it does explain why the same routine works for one person and not another, and it helps you build a routine that works with your biology rather than against it.

Does poor sleep affect weight and blood sugar? Research consistently links short or poor quality sleep with changes in appetite regulation and glucose handling. In practice, people often notice stronger sugar cravings and more difficulty managing weight during periods of poor sleep. Sleep, blood sugar and weight tend to move together, which is why treating them as separate problems rarely works.

When should I see a doctor about sleep? See a doctor if you snore loudly with pauses in breathing, feel severely sleepy during the day, have chest symptoms at night, have low mood lasting more than two weeks, or have had sleep problems for over a month despite reasonable changes.