When Drowsiness and Mental Health Intersect: Understanding the Impact of Sleep on Our Mental Well-Being
Luc LantagneShare
Every year, World Sleep Day draws attention to the importance of sleep for our health. In 2025, this day has taken on particular significance, as it invites us to reflect on the complex relationship between sleepiness and mental health. Indeed, when sleep is disrupted, our mental well-being can suffer, and vice versa.
But why are these two areas so closely linked? How does sleepiness affect our mental health, and how do mental health disorders impact the quality of our sleep?
But why are these two areas so closely linked? How does sleepiness affect our mental health, and how do mental health disorders impact the quality of our sleep?
The relationship between sleepiness and mental health is bidirectional: poor sleep can affect mental health, and conversely, psychological disorders can disrupt sleep.
1. Effects of sleepiness on mental health
Excessive sleepiness can be due to a lack of or poor sleep. Lack of or poor sleep can lead to several negative consequences for mental health, such as:
- Unstable mood and irritability: Insufficient sleep is associated with increased irritability, anxiety, and a tendency toward anger.
- Depression and anxiety: Chronic sleep deprivation can exacerbate depressive and anxious symptoms. Studies show that poor sleep can even be a risk factor for the development of depression.
- Cognitive difficulties: Sleepiness impacts concentration, memory, and decision-making, which can worsen disorders such as anxiety and depression.
- Reduced resilience to stress: Insufficient sleep increases sensitivity to stress, which can worsen the symptoms of pre-existing mental disorders.
2. Inversely, mental health disorders can affect sleep.
Many psychological disorders disrupt the quality and duration of sleep, such as:
- Depression: It is often associated with insomnia or, conversely, hypersomnia. Depressed people often have fragmented and non-restorative sleep.
- Anxiety: Mental hyperactivity due to anxiety can make falling asleep difficult and cause nighttime awakenings.
- Bipolar disorder: During manic phases, the need for sleep decreases, while depressive phases can lead to hypersomnia.
- Post-traumatic stress disorder (PTSD): It is often accompanied by insomnia, nightmares, and disrupted sleep.
- Schizophrenia: It is frequently associated with sleep disorders, particularly a desynchronization of the wake-sleep rhythm.
3. How to break this vicious cycle?
- Establish a regular sleep routine (fixed bedtime and wake-up time)
- Avoid screens and caffeine before bedtime
- Practice relaxation techniques (meditation, deep breathing)
- Exercise regularly. For example, walking is simple and accessible to everyone
- Consult a professional in case of persistent disorders
- Eliminate obstructive sleep apnea
- Take the STOP BANG questionnaire
In summary, good sleep is essential for good mental health, and conversely, taking care of your mental health helps improve sleep quality.
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