Insomnia, difficulty falling asleep, staying asleep, or waking too early is extremely common in Canada. Roughly 10% of Canadians experience chronic insomnia, and many more have occasional sleepless nights. Chronic insomnia makes you tired, it affects mood, concentration, productivity and quality of life.
Understanding why insomnia happens is your first step toward better sleep.
1. Stress & Worry (Mental Load and Daily Pressures)
Stress is one of the most common triggers of insomnia.
Work deadlines, family responsibilities, money concerns, health challenges, or major life changes all activate the “alert system” in your brain. This makes it harder to shut down mentally at night and fall asleep. Even worrying about not sleeping can prolong your insomnia.
Examples include:
- Job uncertainty
- Academic stress (students)
- Financial pressures (e.g., cost of living)
- Anxiety about health or future
2. Poor Sleep Habits & Lifestyle Choices
Habits that seem harmless can disrupt your sleep cycle:
- Going to bed at different times each night
- Watching screens late in the evening
- Napping too late in the day
- Drinking caffeine or alcohol close to bedtime
These behaviours interfere with your body’s internal clock and make it harder to fall asleep, even if you’re tired.
Examples include:
- Late TV or smartphone use
- Caffeine after lunch
- Rotating shift work schedules
3. Mental Health Conditions (Anxiety, Depression & More)
Insomnia often co-exists with mood and anxiety disorders. In fact, many people experiencing chronic insomnia also have one or more mental health conditions.
Psychological tension, persistent worry, intrusive thoughts, and emotional distress can make sleep elusive.
4. Physical Health Problems & Medications
Medical conditions affect your body and can disrupt sleep rhythms too. Conditions linked to insomnia include:
- Chronic pain (arthritis, back pain)
- Respiratory issues
- Heart disease
- Sleep apnea
- Menopausal symptoms
- Thyroid imbalances
Even prescription and over-the-counter medications (especially stimulants, allergy pills, steroids, and some antidepressants) can interfere with sleep.
5. Disrupted Sleep Schedule & Body Clock Misalignment
Your body’s internal clock (circadian rhythm) determines when you should feel sleepy or alert. When this is disrupted by shift work, travel (jet lag), irregular routines, or inconsistent bedtime schedules, your brain struggles to signal sleep at the right time.
Typical triggers include:
- Rotating shift work
- Frequent travel
- Inconsistent sleep/wake times
Why Multiple Causes Often Overlap
Insomnia is usually caused by combination of factors. For example:
- Stress increases mental alertness
- Poor habits delay your internal clock
- Health issues keep you restless at night
Addressing sleep often means tackling several causes together. Resolve Sleep Health offers evidence-based insomnia therapy, primarily CBT-I (Cognitive Behavioural Therapy for Insomnia), the gold-standard, medication-free approach proven to improve sleep long-term.
Frequently Asked Questions
It could be connected to mental health conditions or physical issues like pain, sleep apnea, or medication side effects, which is why a thorough assessment is helpful.
They can contribute significantly, especially when combined with stress or irregular schedules. Changing habits is often an important first step.
Stress triggers your nervous system, increasing alertness and circulating stress hormones, which makes it difficult to relax into sleep.