By Kirstie Vesseur, Registered Clinical Nutritionist (CNA), Legacy Nutrition, NZ and Australia.
You fall asleep easily enough. Then, somewhere between 2 and 4am, your eyes snap open. Your heart is going a little fast, your mind starts running through tomorrow's list, and an hour later you are still staring at the ceiling. By the time you drift off again, the alarm is about to go.
If you regularly wake at 3am, you have probably already tried magnesium, melatonin or cutting back on wine. Waking at the same time most nights is rarely random, and it is not always just "stress". There are a handful of patterns I look for in clinic, and working out which one is yours makes it much easier to choose what will help.
Why do I wake up at 3am? Four common patterns
1. Blood sugar dipping overnight
Overnight, your brain still needs a steady supply of glucose. When blood glucose falls, the body releases counter-regulatory hormones, including adrenaline and cortisol, to bring it back up, and that surge may be enough to wake you. The research on this is strongest in people with diabetes, but in clinic I see the pattern most often in women who:
- Eat dinner early or very light
- Skip meals or run on coffee during the day
- Train hard in the afternoon or evening
- Follow a very low-carbohydrate diet
- Have a sugary dessert or drink close to bed
Waking with a pounding heart, feeling hot or sweaty, or a sudden rush of worry can be clues.
2. A stress system that is switched on at night
Cortisol follows a daily rhythm. It is lowest around the middle of the night, starts climbing in the early hours, and peaks within about 30 to 45 minutes of waking to get you going. Studies in people with chronic insomnia have found higher evening and night-time activity of the stress hormone system, which may make it easier to be pulled out of sleep in the early hours.
3. Changing hormones
Progesterone has a calming effect on the brain, partly through its breakdown product allopregnanolone, which acts on GABA receptors. Oestrogen helps regulate body temperature and mood. When these hormones shift, sleep can become lighter and more broken. Some women notice poorer sleep in the days before their period, and sleep problems become much more common through perimenopause, when night sweats and hot flushes can also wake you. If this sounds like you, my guide to perimenopause in New Zealand covers funded HRT, blood tests and food.
4. A nervous system on high alert
If you are anxious or have been running on adrenaline for a long time, your nervous system can stay partly on guard while you sleep. The second half of the night has more light sleep and less deep sleep, so this is when you are most likely to surface, and the quiet of 3am gives your mind room to spin. My article Your nervous system is talking: are you listening? explores this further.
What is worth checking
Many women are simply told to "reduce stress" or offered a sleeping pill. Knowing your pattern helps you choose what will actually help. Tests worth discussing with your GP or practitioner include:
- Fasting glucose, fasting insulin and HbA1c to look at blood sugar regulation. Some people also wear a continuous glucose monitor for a week or two to see what happens overnight.
- Cortisol testing across the day, such as a dried urine (DUTCH) or salivary test. These are not funded and are best interpreted alongside your symptoms.
- Sex hormones (oestradiol, progesterone, FSH), timed to your cycle, if perimenopause is likely.
- Ferritin, as low iron is linked with restless legs, and thyroid function, as an overactive thyroid can cause poor sleep.
If you snore, wake gasping or wake with headaches, please see your GP about sleep apnoea. It is often missed in women because the symptoms can look like insomnia.
How nutrition can help
A bedtime snack for blood sugar
If blood sugar seems to be the culprit, some women find a small snack with protein and fat 30 to 60 minutes before bed helps. Try:
- 1 boiled egg
- 1 tablespoon of nut butter on half a slice of wholegrain toast
- 2 slices of cheese with a few wholegrain crackers
- A small handful (about 30 g) of almonds or walnuts
- Half a cup (about 125 g) of Greek yoghurt with a tablespoon of pumpkin seeds
Steady blood sugar through the day
- A palm-sized serve of protein (roughly 20 to 30 g) at every meal, starting with breakfast
- Slow carbohydrates such as kūmara, oats, brown rice or lentils at dinner, rather than none at all
- Healthy fats at each meal (olive oil, avocado, nuts)
- No more than 4 to 5 hours between meals during the day
Supplements with some evidence
- Magnesium glycinate: 200 to 350 mg of elemental magnesium with dinner or in the evening. Small trials suggest magnesium may help people fall asleep a little faster, although the evidence is still low quality. Stay at or under 350 mg a day from supplements (the NZ and Australian upper limit), avoid it if you have kidney disease, and reduce the dose if you get loose stools. Take it at least 4 hours apart from thyroxine, and ask your pharmacist about timing if you take tetracycline or quinolone antibiotics or bisphosphonates for bone density.
- Ashwagandha (root extract): trials have mostly used 300 mg twice a day (600 mg a day) for at least 8 weeks, with small improvements in sleep. It is not suitable if you are pregnant or breastfeeding, and it can affect thyroid hormone levels. Medsafe has received reports of liver injury and stomach upsets linked to ashwagandha products, so stop it and see your GP if you notice nausea, dark urine, itching or yellowing of the skin or eyes. Avoid it if you have liver disease, a thyroid condition or an autoimmune condition unless your GP agrees. Do not combine it with sleeping pills or sedatives, and check with your GP if you take thyroid, diabetes, blood pressure or immune-suppressing medicines. Buy from a reputable pharmacy or practitioner rather than social media or unverified websites.
Check with your GP or pharmacist before starting any supplement if you take medication, are pregnant or breastfeeding. The right choice and dose depends on your history and testing, and I tailor this in a consult.
If perimenopause is driving your sleep problems, talk to your GP about whether menopausal hormone therapy, including body-identical (micronised) progesterone, is right for you.
Lifestyle changes that help
Alcohol. A glass of wine may help you fall asleep, but as it is broken down it disrupts the second half of the night, especially at moderate to higher amounts, and some women notice it after just one or two drinks. Try 2 to 3 alcohol-free weeks and see what changes.
Light. Get outside in daylight within an hour of waking, and dim lights and screens for the last hour before bed. This helps set your body clock.
Temperature. Keep your bedroom cool and well ventilated, especially if you run hot or have night sweats.
Caffeine. Caffeine can disturb sleep even 6 hours before bed, so keep coffee and tea to the morning.
When you wake. Try not to check the time or your phone. Breathe slowly with a longer out-breath. If you are still awake after about 20 minutes, get up and read something gentle in dim light until you feel sleepy, then go back to bed.
My free 7-Day Nervous System Reset has more simple practices to calm an alert nervous system.
Frequently asked questions
Why does 3am waking feel so anxious?
Adrenaline released when blood sugar dips, or when the stress system is switched on, creates a physical stress response: a racing heart, alertness and a busy mind. The dark and quiet amplify it. Supporting blood sugar and the stress response often takes the edge off.
Can perimenopause cause 3am waking?
Yes. Falling progesterone and fluctuating oestrogen can make sleep lighter, and night sweats can wake you too. Many women first notice these sleep changes in their 40s.
Will melatonin help me stay asleep?
Melatonin is better studied for falling asleep and for jet lag than for early waking. In New Zealand, since 2025 adults aged 55 and over can get a 2 mg modified-release melatonin tablet from a pharmacist for insomnia, and the rules now also allow some approved low-dose products for adults for short-term insomnia or jet lag, although not all of these are on shelves yet. Children and teens need a prescription. In Australia, a pharmacist can supply 2 mg modified-release melatonin to people aged 55 and over. Melatonin can interact with medicines such as warfarin and other sedating medicines, and can make you drowsy the next day, so talk to your pharmacist or GP before trying it.
Where to start
If 3am has become your unwanted alarm, working out which pattern is driving it is the most useful first step.
Want help with this one-on-one? See how I work with women on women’s hormone support, or browse all my services.
This article is general education, not personal medical advice. Please talk with your GP before starting supplements or changing medication.
References
- Cheah KL et al. Effect of Ashwagandha (Withania somnifera) extract on sleep: a systematic review and meta-analysis. PLoS ONE, 2021. Link
- Mah J, Pitre T. Oral magnesium supplementation for insomnia in older adults: a systematic review and meta-analysis. BMC Complementary Medicine and Therapies, 2021. Link
- Medsafe. Reported adverse reactions to ashwagandha. Prescriber Update, June 2026. Link
- Healthify He Puna Waiora. Melatonin. 2025. Link
- Ebrahim IO et al. Alcohol and sleep I: effects on normal sleep. Alcoholism: Clinical and Experimental Research, 2013. Link
- Baker FC, Lee KA. Menstrual cycle effects on sleep. Sleep Medicine Clinics, 2022. Link
- Bonsignore MR et al. Sex differences in obstructive sleep apnoea. European Respiratory Review, 2019. Link
- Drake C et al. Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed. Journal of Clinical Sleep Medicine, 2013. Link
