Final answer:
Self-observation is an appropriate data collection strategy for studying changes in sleep patterns.
Step-by-step explanation:
In a study involving changes in sleep patterns, self-observation would be an appropriate data collection strategy.
Self-observation involves individuals observing and recording their own behavior or experiences. In the context of studying changes in sleep patterns, individuals can keep a sleep diary where they note their bedtime, wake-up time, and any relevant details about their sleep quality or disturbances. Self-observation allows for the collection of subjective data about sleep patterns, which can complement objective measures like sleep monitoring devices.
Therefore, the statement is true.