Learn to sleep well again: our natural tips for deep sleep 

Have you ever wondered why some nights you wake up tired despite getting the right amount of sleep? Or why, despite a busy day, sleep is slow in coming? In our modern society, where the fast pace of life and screens invade our evenings, sleeping deeply and naturally has become a real challenge.
However, sleep is much more than just rest: it's a complex biological process, orchestrated by our brain and regulated by multiple hormones and neurotransmitters. It has a direct influence on our immunity, mood, memory and even longevity.
In France, almost 42% of adults claim to suffer from at least one sleep disorder (INSV, 2024). And the average length of sleep during the week has fallen to 6h42, below the 7h recommended for optimal recovery. These figures show just how urgent it is to get back to quality sleep.
In this article, we offer you an in-depth understanding of how sleep works, identify the possible causes of disorders, and then discover scientifically-based, natural solutions for getting back to restful nights.

1. Understanding sleep: the basics for better action

Sleep cycles: slow-wave, deep-wave and REM sleep

Human sleep is not linear: it is divided into successive cycles lasting around 90 minutes, each comprising several phases with very distinct characteristics.

• Light slow wave sleep (stages N1 and N2) represents the transition between wakefulness and sleep. Brain activity slows slightly, muscles relax, and awareness of the environment gradually diminishes. This is a fragile phase: noise or light can easily trigger awakening.
• Deep slow-wave sleep (stage N3) is the most physically restorative phase. Brain wave activity becomes very slow (delta waves), blood pressure drops, and heart and breathing rates calm down. It is during this stage that growth hormone secretion peaks, promoting cell regeneration, healing and muscle recovery.
• REM sleep is a paradoxical phase because, despite complete relaxation of muscle tone, brain activity intensifies, close to that of wakefulness. The eyes move rapidly under the eyelids (Rapid Eye Movement). This phase is crucial for memory consolidation, emotional processing and creativity.

These cycles are repeated 4 to 6 times a night. Quality sleep therefore depends not only on the total duration, but also on the ability to link these cycles together without prolonged interruptions.

The role of key neurotransmitters and hormones (melatonin, cortisol, serotonin...)

Sleep is orchestrated by a symphony of chemical molecules:

• Melatonin, nicknamed the " sleep hormone ", is secreted by the pineal gland in response to darkness. It plays a key role in synchronizing our internal biological clock, signalling to our body that it's time to sleep. Its production can be disrupted by late-night exposure to blue light (screens).
• Serotonin, a neurotransmitter derived from the amino acid tryptophan, is the precursor of melatonin. It helps regulate mood andanxiety, two parameters closely linked to sleep onset.
• Cortisol, the so-called " stress " hormone, follows an inverse rhythm: its levels are supposed to fall in the evening to allow sleep, and rise in the morning to promote wakefulness. Chronic stress or an unbalanced lifestyle can throw this curve out of sync, making it difficult to fall asleep.

Understanding this hormonal interplay enables us to better identify why an unbalanced lifestyle or inappropriate habits can disrupt sleep.

Sleep needs according to age and lifestyle

Contrary to popular belief, sleep needs evolve not only with age, but also with the intensity of physical activity, stress and individual characteristics.

• For adults, specialists recommend 7 to 9 hours sleep per night for optimal recovery. However, according to INSV, more than a third of French people sleep less than 6 hours, leading to chronic fatigue and mood disorders.
• In the elderly, the need for sleep duration remains similar, but sleep becomes more fragmented: nocturnal awakenings are more frequent, and the deep sleep phase tends to be reduced. It is therefore essential to adopt a favorable routine and environment.
• For children and teenagers, sleep is essential for brain development, growth and learning consolidation: they need 9 to 12 hours of sleep, depending on their age.

2. Identify the causes of sleep disorders

Psychological causes: stress, anxiety, ruminations

Stress andanxiety are among the leading causes of sleep disorders. During a stressful episode, the brain releases cortisol and other stress hormones that increase alertness. This phenomenon, useful for reacting in the face of danger, becomes problematic when it continues into the evening: falling asleep is delayed and sleep is lighter.

Mental ruminations, i.e. the replaying of thoughts, are also a major obstacle: they maintain a high level of brain activity incompatible with the onset of deep sleep. Adopting relaxation or breathing techniques can help break this vicious circle.

According to the INSV/MGEN 2024 survey, nearly 70% of people who say they have trouble sleeping cite stress as the main cause.

Environmental causes: blue light, noise, inadequate bedding

The environment plays a crucial role in sleep quality:

• Blue light from screens (smartphones, tablets, computers) inhibits melatonin secretion. An INSERM study (2023) showed that 72% of French people use a screen in the hour before bedtime, increasing the risk of difficulty falling asleep and fragmented sleep.
• Even low-intensity noise can interrupt sleep cycles. A single 40 dB noise peak (e.g. a passing car) is enough to trigger a micro-awakening, often unconscious but disrupting the quality of deep sleep.
• Inadequate bedding (mattress too soft or too firm, unsuitable pillow) can lead to physical discomfort, muscle or joint pain, and frequent waking at night.

Physiological causes: hormonal imbalances, deficiencies in key nutrients

Hormonal imbalances can upset the sleep-wake rhythm. For example:

• Thyroid disorders (hyperthyroidism, hypothyroidism) disrupt body temperature and metabolism, two essential parameters for falling asleep.
• In women, perimenopause and menopause are accompanied by hormonal fluctuations (estrogen, progesterone) that promote insomnia, nocturnal hot flashes and early wakefulness.

Nutritional deficiencies, particularly in magnesium or vitamin B6, also influence sleep quality: these micronutrients help regulate serotonin and therefore melatonin. According to Santé Publique France, 1 in 4 French people have an inadequate intake of magnesium.

3. Natural solutions to improve sleep quality

Regular schedules and consistent sleep/wake cycles

Our biological clock, or circadian rhythm, operates on a cycle of around 24 hours. Going to bed and getting up at irregular times each day disrupts this clock: the brain no longer knows when to trigger melatonin production. Having a fixed schedule reinforces the synchronization of this rhythm and makes it easier to fall asleep.

The importance of exposure to natural light in the morning

Morning light is a powerful signal for our internal clock: it stops the production of melatonin and stimulates alertness. Exposure to natural light for 15 to 30 minutes every morning helps to "reset" the biological clock, which is particularly useful in the event of jet lag or disrupted sleep schedules.

Magnesium, tryptophan, vitamin B6: their role explained

• Magnesium: an essential mineral for muscle and nerve relaxation. It plays a role in regulating neuronal excitability, helping to calm the nervous system.
• Tryptophan: amino acid precursor of serotonin and melatonin. Dietary intake directly influences the brain's ability to produce these neurotransmitters.
• Vitamin B6: essential cofactor in the conversion of tryptophan into serotonin. A deficiency can therefore limit melatonin synthesis.

Advice on foods to choose or avoid in the evening

To promote quality sleep, give priority to :

• Foods rich in tryptophan: dairy products, bananas, eggs, poultry, cashew nuts.
• Foods rich in magnesium : almonds, spinach, wholegrain cereals, pumpkin seeds.
• Foods providing vitamin B6: oily fish (salmon, mackerel), chickpeas, offal.

On the other hand, avoid :

• Caffeinated drinks (coffee, black tea, soft drinks) after 4pm.
• Alcohol, which disrupts sleep cycles and encourages nocturnal wakefulness.

Meditation, cardiac coherence, sophrology

To counter stress and calm mental activity before bedtime, scientifically recognized relaxation techniques can be incorporated into your routine:

• Mindfulness meditation: by concentrating on breathing or bodily sensations, it reduces the activity of brain areas linked to ruminations. Clinical studies show that it improves sleep onset and sleep quality, particularly for people suffering from chronic insomnia.
• Cardiac coherence: a breathing practice based on regular cycles (e.g. 5-second inhalation, 5-second exhalation for 5 minutes). It acts on the autonomic nervous system by promoting a balance between the sympathetic (activation) and parasympathetic (calming) branches, enabling physiological relaxation conducive to falling asleep.
• Sophrology: a method combining muscle relaxation, controlled breathing and positive visualization. It helps release tension and disconnect from everyday concerns.

These approaches are harmless and can be used in conjunction with medical support if required.

A little help from nature

When the adoption of good habits and the establishment of a soothing routine are not enough to restore quality sleep, supplementation can be a valuable aid in rebalancing the terrain and promoting serene sleep.

4. Create an environment conducive to sleep

Room layout: temperature, darkness, bedding

The physical environment of the bedroom directly influences the ability to fall asleep and maintain deep sleep:

• Temperature: a room that's too warm (>22°C) disrupts the drop in body temperature needed to fall asleep. Ideally, the temperature should be between 18 and 20°C.
• Darkness: even dim light (nightlights, LEDs) can inhibit melatonin production. Using blackout curtains or a sleep mask is an effective solution.
• Adapted bedding: a quality mattress and pillow, chosen according to your morphology and sleeping position (dorsal, lateral), prevent muscular tension and the micro-awakenings associated with discomfort.

The bedtime ritual: the importance of a soothing routine

A regular ritual at the end of the day sends a clear signal to the brain that it's time to relax: reading, soft music, gentle stretching, herbal tea (e.g. lime blossom, chamomile). These calm activities lower alertness levels and ease the transition to sleep.

Screen and noise reduction: scientific explanations of their effects

• Screens: the blue light emitted by LED screens (smartphones, tablets, computers) suppresses melatonin secretion for up to 2 hours after exposure. Experts recommend avoiding screens at least 1 hour before bedtime, or using "night light" / "night shift" filters to limit this effect.
• Noise: even low-intensity sounds (30-40 dB, e.g. light snoring) increase the frequency of micro-awakenings. A simple solution is to use earplugs, or install acoustic curtains if the outside environment is noisy.

Conclusion

Improving your sleep naturally requires a detailed understanding of its mechanisms, identification of the causes of sleep disorders, and the adoption of habits that help you fall asleep peacefully. A healthy lifestyle, a healthy diet, relaxation techniques, gentle plants and an optimized environment are all powerful levers for restful nights.

These simple but effective gestures, applied regularly, can transform the quality of your nights and, by extension, your overall health and daily well-being.

Finally, if your sleep problems persist despite the implementation of these solutions, don't hesitate to consult a healthcare professional to identify the medical causes and consider appropriate treatment.