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The 3P model explains why insomnia can start during a stressful period and still continue long after the trigger is gone. Here is the straight version: chronic insomnia is usually maintained by what happens after the bad stretch begins.

What the 3Ps are

Predisposing factors are background vulnerabilities, such as light sleep, anxiety tendency, chronic pain, or family history.

Precipitating factors are triggers, such as illness, loss, schedule disruption, new caregiving demands, or acute stress.

Perpetuating factors are the habits and thought loops that keep insomnia going, even after the trigger improves.

Why perpetuating factors matter most

When sleep gets rough, most people compensate by going to bed earlier, sleeping in, napping, or staying in bed awake for long periods. These moves feel logical but can weaken sleep drive and condition the bed as a place of frustration. That is often where chronic insomnia is maintained.

What to do

Step 1: Identify your perpetuating factors: extra time in bed, irregular wake time, naps, alcohol as a sleep aid, catastrophizing.

Step 2: Anchor wake time and tighten time in bed to rebuild sleep drive.

Step 3: Use stimulus control: if awake and frustrated, get out of bed and reset.

Step 4: Add cognitive restructuring for unhelpful beliefs about sleep.

Step 5: Address ongoing stressors, pain, or mood symptoms in parallel, not sequentially.

Common traps

Wrong assumption: "When stress improves, sleep will automatically normalize." Sometimes yes, often no.

Bad advice: "Just do sleep hygiene." Hygiene helps, but chronic insomnia usually needs full CBT-I targets.

Identity trap: "I am just a bad sleeper." Predisposition is risk, not destiny.

When to get help

If insomnia has lasted months, or if self-directed changes have not shifted the pattern, get a structured evaluation to rule out comorbid sleep disorders and build a full treatment plan.

Bottom line

• The 3P model explains insomnia clearly: vulnerability, trigger, then maintenance.
• For chronic insomnia, treatment usually succeeds when it targets perpetuating factors directly.
• CBT-I is designed for exactly this: rebuild sleep drive, reset bed association, and update unhelpful beliefs.

Next: Sleep restriction: why less time in bed can help—the counterintuitive move that targets perpetuating behavior head-on.

Educational content only; this is not personalized medical advice. If you have urgent symptoms, seek emergency care.