Which of the following is an example of stimulus control related to the treatment of insomnia?

Stimulus control is a behavioral treatment approach used in the management of insomnia. It involves creating a strong association between the bed and sleep, which is crucial for establishing a healthy sleep routine. One effective method of stimulus control is going to bed only when one feels sleepy. This practice helps reinforce the link between the bed and the feeling of sleepiness, encouraging a natural sleep pattern.

When individuals go to bed at irregular times or when not feeling sleepy, it can lead to laying awake in bed, which can enhance anxiety around sleep and decrease the effectiveness of the bed as a cue for sleep. Therefore, the strategy of going to bed only when sleepy helps in conditioning the mind and body to respond to the bed as a place for sleep, thus improving sleep quality over time.

The other options provided do not effectively establish this same strong association between the bed and sleep. Using the bedroom for various activities can create confusion about the purpose of the space, while sleeping longer on weekends might disrupt the regular sleep-wake cycle, and avoiding bright light exposure is more related to managing circadian rhythms than to stimulus control in the context of insomnia.