Why Sleep Aids Often Disappoint, and the Habits That Matter More

Last updated: October 2026.

Sleeping tablets, supplements, sprays, gummies, apps: there is no shortage of products promising better sleep. Yet many people try one after another and end up back where they started. This guide explains why sleep aids so often disappoint, what the evidence says actually helps, and where supplements, including CBD, sensibly fit in.

Important: if you have had trouble sleeping for more than a few weeks, or your sleep is affecting your daily life, speak to your GP.

The short answer

• Most sleep aids target the symptom (not sleeping) rather than the cause.
• The habits behind good sleep, such as a consistent wake time, light, caffeine and stress, matter more than any product.
• For long-term insomnia, guidelines recommend cognitive behavioural therapy for insomnia (CBT-I) first.
• Supplements can be part of a routine, but they cannot replace one, and they cannot claim to treat sleep problems.

Why sleep aids often disappoint

They treat the symptom, not the cause

Sleep problems usually have causes: stress, an irregular schedule, late caffeine, alcohol, screens, shift work, pain, a bedroom that is too warm or bright, or a medical condition such as sleep apnoea. A product that makes you drowsy does nothing about those causes, so when you stop taking it, the problem is still there.

Tolerance and side effects

Prescription sleeping tablets can be useful in the short term, but some become less effective with regular use, and they can cause next-day drowsiness. That is why doctors usually prescribe them for short periods only.

Weak evidence for many supplements

Many products marketed for sleep are backed by small, short studies, or by research on a different ingredient or dose from the one in the product. A confident label is not the same as good evidence.

Expectations

Sleep varies naturally from night to night. If you expect a product to give you perfect sleep every night, almost anything will feel like it has failed. Judging any change over two to four weeks, with a simple sleep diary, gives a fairer picture.

What the evidence says works

The approaches with the strongest evidence are not products at all:

• A consistent wake time, seven days a week, is the single most powerful habit for resetting your body clock.
• Morning daylight, even 10 to 20 minutes outside, helps anchor your rhythm.
• Caffeine before early afternoon only.
• Little or no alcohol in the evening; it fragments sleep later in the night.
• A cool, dark, quiet bedroom.
• A wind-down routine of 30 to 60 minutes without work or screens.
• Only going to bed when sleepy, and getting up if you have been lying awake for a long time.
• CBT-I, cognitive behavioural therapy for insomnia, which clinical guidelines recommend as the first treatment for chronic insomnia. Ask your GP.

A simple evening routine

Time before bed	What to do
3 hours	Finish your last large meal; keep alcohol light
90 minutes	Dim the lights; finish work and difficult conversations
60 minutes	Screens away; a warm shower or bath
45 minutes	A caffeine-free drink; reading, stretching or music
30 minutes	Into bed only when sleepy; keep the room cool and dark

Keep the same wake-up time every morning, even after a poor night. It feels hard at first, but it is what resets your sleep drive.

Common sleep myths

Myth	Fact
“Everyone needs exactly eight hours.”	Most adults need roughly 7 to 9 hours, and needs vary from person to person.
“A nightcap helps you sleep.”	Alcohol can help you nod off but disrupts sleep later in the night.
“You can catch up at the weekend.”	Long lie-ins shift your body clock and make Sunday night and Monday morning harder.
“Lying in bed resting is as good as sleep.”	Lying awake for long periods can teach your brain to link bed with being awake. If you cannot sleep, get up for a while.
“If a sleep aid did not work in one night, it does not work.”	Sleep varies night to night; judge any change over two to four weeks.

Shift workers and new parents

Some people cannot follow standard sleep advice, and that is fine. If you work shifts, keep your sleep times as consistent as your rota allows, use blackout blinds and an eye mask for daytime sleep, and avoid bright light on the way home after a night shift. If you have a new baby, sleep when you can, share night feeds where possible, and lower the bar for everything else for a while. In both cases, talk to your GP if exhaustion is affecting your safety, such as when driving.

Where do supplements fit in?

Supplements can be part of an evening routine, but they work best alongside the habits above, not instead of them. A few points to know:

• Melatonin is a prescription-only medicine in Ireland, not a supplement.
• Magnesium is a common supplement; read our guide to magnesium and CBD if you are curious.
• Herbal teas, such as chamomile or tulsi, are a pleasant caffeine-free ritual.
• CBD is sold as a food supplement. Some people like to include it in their evening routine, but research on CBD and sleep is still limited, and it cannot claim to treat sleep problems.

If you choose to include CBD, take it at the same time each evening, start low, such as 5 drops of a 10% oil, and keep everything else consistent so you can judge it fairly. Speak to your GP or pharmacist first if you take any medication, especially sleeping tablets or sedatives. Read more in CBD and dreams.

Keep a two-week sleep diary

• what time you went to bed and got up
• roughly how long it took to fall asleep
• how many times you woke
• caffeine, alcohol and exercise that day
• anything you took, and when
• how rested you felt, from 1 to 10

Two weeks of notes usually reveals a pattern, and it is exactly what your GP will find useful if you need to see them.

When to see a GP

• poor sleep for more than a few weeks
• daytime sleepiness that affects work, driving or safety
• loud snoring, gasping or pauses in breathing at night
• an urge to move your legs in the evening or at night
• low mood or anxiety affecting your sleep

Some of these can be signs of conditions such as sleep apnoea or restless legs syndrome, which have specific treatments.

Frequently asked questions

Why do sleep aids stop working?

Some sleeping medicines become less effective with regular use as the body adapts, and many supplements are only studied in small, short trials. Sleep aids also cannot fix the habits and routines that drive most sleep problems.

What is the most effective treatment for long-term insomnia?

For chronic insomnia, clinical guidelines recommend cognitive behavioural therapy for insomnia (CBT-I) as the first-line treatment. Ask your GP about it.

Is melatonin available over the counter in Ireland?

No. In Ireland, melatonin is a prescription-only medicine.

Does CBD help you sleep?

CBD is sold as a food supplement and cannot claim to treat sleep problems. Some people like to include it in their evening routine, but the research on CBD and sleep is still limited.

How long should a wind-down routine be?

About 30 to 60 minutes is enough for most people. Consistency matters more than length.

Is it bad to use my phone in bed?

Screens keep your mind active and can push back the time you feel sleepy. Try putting your phone away for the last 30 to 60 minutes before bed.

Should I nap if I slept badly?

A short nap of 20 minutes before mid-afternoon is fine for most people. Long or late naps can make the next night harder.

When should I see a GP about sleep?

If poor sleep lasts more than a few weeks, affects your daytime life, or you snore loudly, stop breathing at night or have restless legs, see your GP.

Can alcohol help me sleep?

Alcohol may help you nod off, but it disrupts sleep later in the night and reduces sleep quality. It is best avoided close to bedtime.

What time should I stop drinking coffee?

Caffeine can stay in your system for many hours. Many sleep experts suggest no caffeine after early afternoon.

Are sleep trackers useful?

They can show patterns over time, but they are not always accurate, and checking them too often can make some people more anxious about sleep. Use them as a rough guide.

Can exercise help sleep?

Regular physical activity is linked with better sleep for many people. Try to finish vigorous exercise a few hours before bed.

Is it normal to wake during the night?

Yes. Most people wake briefly several times a night and do not remember it. It becomes a problem when you lie awake for long periods regularly.

Disclaimer: CBD is sold as a food supplement. It is not intended to diagnose, treat, cure or prevent any disease and is not a substitute for medical advice. Always consult a healthcare professional before starting a new supplement, especially if you take medication, are pregnant or breastfeeding.