Which question best assesses a client's risk for waking during the night due to lifestyle choices?

To assess a client's risk for waking during the night due to lifestyle choices, asking about smoking habits is particularly relevant. Smoking can significantly affect sleep quality due to both the stimulant effects of nicotine and the withdrawal symptoms that may occur during the night. Smokers can experience disrupted sleep patterns, increased awakenings, and reduced overall sleep quality.

In contrast, while the other questions touch on various aspects of sleep habits and routines, they do not directly correlate with lifestyle choices that have a well-documented impact on sleep disturbances like smoking does. For example, self-identifying as a deep sleeper does not provide insight into specific behaviors that could disrupt sleep. Keeping the television on when falling asleep relates more to environmental factors than lifestyle choices, and a regular bedtime routine is generally associated with better sleep hygiene rather than a risk factor for awakening.

Thus, inquiring about smoking is the most effective way to gauge how lifestyle choices may influence the likelihood of nighttime awakenings.