You feel tired upon waking despite long nights? Do you toss and turn constantly, or wake up in the middle of the night for no reason? This guide reviews the 7 most common causes of disturbed sleep, with concrete solutions to address them.

Understanding Sleep: A Fragile Balance

Sleep is structured in 90-minute cycles, alternating between light, deep, and paradoxical phases. Its quality depends on the regularity of these cycles, as well as factors related to the environment, lifestyle, and emotional state.

Disturbed sleep can lead to:

  • Drowsiness
  • Irritability
  • Decreased concentration
  • Increased long-term risks of cardio-metabolic diseases

The 7 Common Causes of Poor Sleep

1. Stress and Anxiety

Overwhelming thoughts, rumination, mental tension… Mental hyperactivation prevents falling asleep and disrupts nighttime recovery.

2. Poor Sleep Hygiene

  • Irregular schedules
  • Use of screens before bedtime
  • Caffeine after 4 PM
  • Heavy or late meals

3. Inadequate Sleep Environment

  • Unsuitable mattress or pillow
  • Bedroom temperature too warm
  • Noise, light, stale air

Tip: A quiet, dark, well-ventilated room at 18 °C is ideal for good sleep.

4. Circadian Rhythm Disorders

Night work, jet lag, prolonged screen use disrupt the biological clock. Result: difficulty falling asleep, non-restorative sleep.

5. Sleep Disorders

  • Sleep Apnea: breathing interruptions causing micro-awakenings
  • Restless Legs Syndrome: irresistible urge to move
  • Chronic Insomnia: requires specialized care

6. Stimulants or Sedatives

  • Coffee, tea, tobacco, alcohol
  • Certain medications like corticosteroids or antidepressants

They alter the structure or depth of sleep.

7. Psychological or Hormonal Factors

  • Mood disorders or depression
  • Hormonal changes (menopause, pregnancy)
  • Chronic stress or burnout

Concrete Examples

  • Shifted Schedules: Daytime sleep is naturally more fragmented as it conflicts with the biological clock. Gradually adjusting bedtime and wake-up times helps resynchronize the circadian rhythm.
  • Unsuitable Mattress + Screens in Bed: A common combination — postural discomfort and the light stimulation from screens delay falling asleep and increase nighttime micro-awakenings.

Our Practical Tips for Restoring Peaceful Sleep

Create a Bedtime Routine

  • Fixed hours
  • Calm activities before sleep (reading, soft music, meditation)

Arrange Your Environment

  • Suitable bedding (mattress, pillow, duvet)
  • Dark, quiet, temperate room (16–18 °C)

Regulate Your Light Exposure

  • No screens an hour before bedtime
  • Enjoy natural light during the day

Limit Stimulants

  • No coffee after 3 PM
  • Reduce alcohol and tobacco

Consult for Persistent Issues

If your troubles last more than 3 weeks, consult a doctor or a sleep center (see INSV for addresses in France).

To learn more, check out our guide on nighttime micro-awakenings and our guide to improving sleep without medication .

Discover bedding solutions for better sleep at lematelas.fr

FAQ: Answers to Your Frequently Asked Questions

Is it normal to wake up at night?Yes, a few awakenings are physiological. They become problematic if they are frequent or prevent you from falling back asleep.
Does alcohol help you sleep?No. It facilitates falling asleep but alters sleep quality and promotes nighttime awakenings.
Does exercising in the evening prevent sleep?Intense physical activity late in the day can delay falling asleep. Prefer a session during the day or early evening.
Can a bad mattress really cause sleep disturbances?Yes. A mattress that is too soft creates sagging in the pelvis, which generates muscle tension and micro-awakenings. A mattress that is too warm disrupts nighttime thermoregulation. A worn mattress (sagging, visible springs) is one of the most common and underestimated causes of poor sleep quality.
How do I know if my sleep troubles require medical consultation?If you experience persistent fatigue for more than 3 weeks despite good habits, significant snoring with breathing pauses, or systematic awakenings at the same time, consult your primary care physician or a sleep center accredited by INSV.