Tired All Day? 7 Ways to Support Better Sleep with PMOS

If you have PMOS and feel permanently tired, it is tempting to assume that you simply need to get to bed earlier. Sometimes that helps. But good sleep is not only about the number of hours you spend in bed.

Sleep timing, light exposure, caffeine, movement, stress and underlying sleep disorders can all affect how rested you feel. PMOS itself also appears to be associated with a greater burden of sleep problems, including obstructive sleep apnoea.

The good news is that supporting sleep does not require a perfect evening routine or an expensive collection of supplements. Start with the basics that have the strongest evidence behind them.

Here are seven places to begin.

1. Anchor Your Day with a Regular Wake Time
When sleep has gone off track, people often focus entirely on bedtime. In practice, your wake time can be just as useful.

Your body has an internal circadian clock that helps coordinate sleep and wakefulness across roughly 24 hours. Keeping your wake time reasonably consistent gives that system a regular daily cue.

This does not mean you need to get up at precisely 6.42am every day or panic if you have a lie-in at the weekend. The aim is consistency, not perfection.

If your sleep pattern currently varies considerably, begin by choosing a realistic wake-up window that you can maintain most days. Once that becomes more consistent, your evening sleepiness may also become more predictable.

This can be particularly useful in autumn and winter, when darker mornings and evenings can make our usual light cues less obvious.

2. Get Outside in the Morning
Light is one of the strongest environmental signals to our circadian system.

Morning daylight tells the brain that the biological day has begun and helps reinforce the timing of the sleep-wake cycle. You do not need specialist equipment to make use of this. For most people, simply getting outdoors after waking is a sensible starting point.

That could mean walking the dog, drinking your morning coffee outside, walking part of the school run or stepping outside before beginning work.

3. Look at When You Are Drinking Caffeine
Caffeine can be extremely useful when you are tired, which is precisely why it can become part of a difficult cycle. Poor sleep leads to more coffee. More coffee, particularly later in the day, can then make the following night's sleep harder.

A 2023 systematic review and meta-analysis found that caffeine reduced total sleep time and sleep efficiency and increased the time it took to fall asleep. The researchers estimated that a typical coffee containing around 107 mg caffeine would need to be consumed approximately nine hours before bed to avoid reducing total sleep time.

That does not mean everyone needs a rigid nine-hour caffeine curfew. People metabolise caffeine differently and the caffeine content of coffee varies enormously. But if you are struggling with sleep, it is worth experimenting.

If you normally have caffeine throughout the afternoon, try moving your final coffee or caffeinated tea earlier for a couple of weeks and see whether anything changes.

Remember that caffeine can also turn up in energy drinks, cola, chocolate and pre-workout products.

4. Move Your Body, Even If You Are Tired
Exercise often gets presented as another thing you “should” be doing for PMOS. I prefer to think of movement as something that can support several systems at the same time.

Regular physical activity can benefit metabolic health, mood and cardiovascular fitness, and research also supports a role for exercise in improving sleep quality.

A 2025 systematic review and meta-analysis of 81 randomised controlled trials found that exercise improved both subjective sleep quality and objective sleep efficiency in non-athlete adults.

You do not need to train intensely to benefit.

Walking, resistance training, cycling, swimming, Pilates and other forms of movement can all contribute. The best option is one you can do consistently and recover from.

And if evening exercise works for you, you do not automatically need to stop. The idea that everybody must avoid exercise after a certain time is too simplistic. Pay attention to your own response. If a hard late-night session leaves you wired at bedtime, move it earlier where practical. If an evening Pilates class helps you unwind, there may be no reason to change it.

5. Eat Regularly Rather Than Trying to Be “Good” All Day
There is no magic PMOS dinner that guarantees eight hours of uninterrupted sleep.

But how you eat during the day can affect how you feel in the evening.

If you have survived on coffee, skipped lunch and tried to keep calories as low as possible, arriving home ravenous at 7pm is not a character flaw. It is a predictable biological response.

For many women with PMOS, regular meals containing adequate protein, fibre-rich carbohydrates, vegetables and healthy fats are a more useful foundation than swinging between restriction and overeating.

Try to make dinner satisfying rather than deliberately tiny. Equally, if very large or rich meals close to bedtime leave you uncomfortable or refluxy, give yourself more time between eating and lying down.

Alcohol is worth noticing too. It may make you feel sleepy initially, but sedation is not the same as good-quality sleep and alcohol can fragment sleep later in the night.

The goal is not another set of food rules. It is to remove avoidable obstacles to sleep.

6. Give Your Brain a Chance to Wind Down
The advice to “avoid screens” before bed is often presented as though blue light is the whole story.

It is more complicated than that.

Screens can affect sleep through light exposure, but also because of what we are doing on them. Work emails, social media, upsetting news or an absorbing television series can keep the brain alert long after we intended to switch off.

Try and create some separation between your active day and sleep. That might mean lowering the lights, putting work away, reading, stretching, having a shower or writing tomorrow's jobs down so you are not rehearsing them in bed.

7. Know When Sleep Hygiene Is Not Enough
This may be the most important tip.

If you are consistently giving yourself enough opportunity to sleep but still wake exhausted, the answer is not necessarily better curtains, magnesium or another cup of herbal tea.

The updated International Evidence-Based PMOS Guideline highlights the increased prevalence of obstructive sleep apnoea in women with PMOS. Snoring combined with waking unrefreshed, daytime sleepiness or fatigue warrants further assessment. Importantly, this increased prevalence is not explained by BMI alone.

Other symptoms such as waking gasping or choking, witnessed pauses in breathing or morning headaches also deserve medical attention.

Long-term insomnia deserves proper support too. NICE recommends cognitive behavioural therapy for insomnia, CBT-I, as first-line treatment for chronic insomnia rather than relying on sleep-hygiene advice alone.

Persistent fatigue can also have other causes, including iron deficiency, thyroid problems, mood disorders and medication effects. If you are sleeping for what should be long enough but still feel exhausted, discuss it with your GP.

Start with One Thing
If your sleep is poor, you do not need to tackle all seven of these tomorrow.

Choose the issue that sounds most like you.

If you drink coffee at 4pm, start there. If you barely see daylight until lunchtime, try a morning walk. If your bedtime varies by three hours every night, work on consistency. If you snore and wake exhausted, make the GP appointment rather than buying another sleep supplement.

Sleep matters in PMOS, but it should not become another area in which you feel you have to be perfect.

The aim is not to achieve an immaculate bedtime routine.

It is to understand what may be getting in the way of restorative sleep and make the changes that are actually worth making.