How short-term insomnia becomes chronic

Almost everyone has a few bad nights after a stressful event. So why does insomnia stick around for some people long after the stress is gone?

About 95% of adults will experience insomnia at some point. A divorce, a job loss, a death in the family, a surgery, a baby, a bad week at work — most stressful life events come with a few nights of bad sleep. That's normal, and it's almost universal.

What's not universal is what happens next. For most people, sleep returns to normal once the stressor passes. For a smaller group, the insomnia stays — and outlasts the original cause by months or years.

Sleep researchers have a clean explanation for why. It's called the 3P model, and it's one of the most useful frameworks in all of sleep medicine.

The three Ps

Developed by sleep researcher Dr. Arthur Spielman in 1987, the model breaks insomnia into three contributing factors:

1. Predisposing factors. What you start with. Some people have nervous systems that are biologically more reactive — lighter sleepers, more easily aroused, more prone to anxiety. Genetics, personality, and even sex (women report insomnia more often) all play a role. Predisposing factors don't cause insomnia. They make you more vulnerable to it when something goes wrong.

2. Precipitating factors. What triggers the first bad nights. A specific stressor: an illness, a deadline, a loss, a major life change, a hormonal shift. This is the spark. Almost everyone gets sparked at some point. For most people, when the spark fades, sleep returns.

3. Perpetuating factors. What keeps insomnia alive long after the spark is gone. This is the part that turns a few rough weeks into chronic insomnia — and it's almost entirely behavioral.

The third P is where chronic insomnia lives

Once you've had a few bad nights, you start trying to fix them. The fixes feel logical. Most of them make things worse.

Common ones, all of which Jacobs lists in his clinical work:

• Going to bed earlier to "give yourself more chances" to sleep. Result: you spend more time lying awake, which trains your brain to associate the bed with wakefulness.
• Sleeping in on weekends to catch up. Result: your circadian rhythm shifts later, making Sunday night even harder.
• Trying harder to fall asleep. Result: the effort itself produces arousal, which makes sleep less likely.
• Napping during the day because you're exhausted. Result: less sleep pressure at night.
• Drinking alcohol to wind down. Result: faster sleep onset, but fragmented and lighter sleep in the second half of the night.
• Drinking more caffeine to compensate for daytime fatigue. Result: longer-lasting cognitive arousal at bedtime.
• Reducing exercise because you feel tired. Result: a flatter body-temperature rhythm, less sleep drive.
• Lying in bed worrying about not sleeping. Result: the bed becomes a learned cue for anxiety.

Each of these is a sane response to a frustrating problem. But they all do the same thing: they teach your brain and body new patterns that make sleep harder. Even after the original stressor is long gone, the patterns remain — and the insomnia continues, on its own.

Why this is good news

If you've had insomnia for a long time, you may have wondered if something about you is the problem. The 3P model offers a more accurate frame:

• The predisposing factors are mostly outside your control, but they're not destiny.
• The precipitating factor has probably already passed — it's not what's keeping you awake now.
• The perpetuating factors are what's keeping you awake, and they're learned. Which means they can be unlearned.

This is exactly what Cognitive Behavioral Therapy for Insomnia (CBT-I) targets. Not the original cause. Not your personality. The specific habits — going to bed earlier, lying in bed awake, trying to force sleep — that turned a temporary problem into a chronic one.

A small reframe

If you've been sleeping badly for years, you probably feel like you're fighting something fixed and immovable. The 3P model says the opposite: most of what's keeping you awake right now isn't your original trigger or your underlying biology. It's the well-meaning but unhelpful habits you've built to cope. Those are the things you can change.

That's a much smaller, more solvable problem than the one chronic insomnia usually feels like.

Lull is a calm bedtime audio app for adults with insomnia, designed to help you fall asleep without overstimulation. Free at lullstories.com.