Why You Can’t Sleep: Common Causes and Practical Steps
Insomnia is more than a bad night. It is a pattern of difficulty falling asleep, staying asleep or waking too early, despite having the chance to sleep, together with daytime consequences. Understanding why it persists is the first step to treating it.
Key takeaways
- Chronic insomnia means trouble sleeping at least three nights a week for three months.
- Cognitive behavioral therapy for insomnia (CBT-I) is the recommended first treatment.
- Sleeping pills are usually short-term options, discussed with a doctor.
What counts as insomnia?
Clinicians diagnose chronic insomnia when sleep trouble happens at least three nights a week for at least three months and causes daytime problems like fatigue, poor concentration or low mood. Shorter spells are called short-term insomnia and are common around stress or illness.
Why it starts and why it sticks
Sleep researchers often describe three layers. Predisposing factors, like a light-sleeper temperament, set the stage. Precipitating events, such as a stressful month, start the problem. Perpetuating habits, like staying in bed for hours, napping or worrying about sleep, keep it going long after the stress has passed. Most treatment targets the third layer.
CBT-I: what it involves
CBT-I usually includes stimulus control (use the bed for sleep, leave it when awake), sleep scheduling, relaxation and challenging unhelpful thoughts about sleep. Major bodies, including the American College of Physicians, recommend it as first-line treatment, and benefits tend to last longer than medication. It can be delivered by a trained clinician or through validated programs.
Things you can do now
- Keep a fixed wake-up time every day.
- Limit time in bed to when you are actually sleepy.
- Avoid long naps and late caffeine.
- Do something calm if awake for a long time, in dim light.
Medicines
Doctors may prescribe sleep medicines for short periods, but they can cause drowsiness, dependence and next-day impairment. Over-the-counter sleep aids, including antihistamines, can cause grogginess and are not suitable for everyone. Always discuss options with a doctor or pharmacist.
Check for other causes
Insomnia can accompany depression, anxiety, pain, restless legs, sleep apnea, thyroid problems and medicines. Treating those can help sleep.
Frequently asked questions
Will insomnia go away on its own?
Short-term insomnia often does. Chronic insomnia usually needs targeted treatment such as CBT-I.
Is it insomnia if I sleep six hours?
Not necessarily. Insomnia is about difficulty sleeping and daytime impact, not just a number of hours.
References and further reading: Qaseem et al., 2016, Annals of Internal Medicine (American College of Physicians insomnia guideline); Spielman et al., 1987 (three-factor model of insomnia); American Academy of Sleep Medicine guidance.