Contain worry in a designated worry period

Defer non-urgent worry to a fixed 20-minute window later in the day.

Why it works

Worry intrudes because the mind treats unfinished concern as an open loop demanding immediate attention. Scheduling a specific worry period signals to the brain that the loop will close — just not now — which reduces the urgency that sustains intrusion. This is a form of stimulus control: over time, worry becomes associated with the designated period rather than spreading across the day.

How to do it

1. Choose a consistent 20-minute window, not within two hours of bedtime.
2. When worry arises outside that window, write a one-line note and say: "I’ll think about this at [time]."
3. When the worry period arrives, sit with your list and apply the worry tree decision.
4. After the period, close the list and redirect attention deliberately.

Evidence

Stimulus-control and worry postponement protocols have been tested in randomised trials for generalised anxiety and show reductions in worry frequency and intensity compared to control conditions. (rct)

Sample sizes in the early trials were small; the finding has been replicated in broader CBT-for-GAD packages but the postponement component is rarely tested in isolation in larger trials.

Sources

• Borkovec, Wilkinson, Folensbee & Lerman (1983), Stimulus control applications to the treatment of worry, Behaviour Research and Therapy

Common mistake

Setting the worry period right before bed, which activates anxious thinking precisely when you need to wind down. Evening worry periods reliably worsen sleep-onset anxiety.