What concern does Tina express regarding sleep?

Tina's concern about the effects of lack of sleep on functioning underscores a critical aspect of mental health. Insufficient sleep can lead to a multitude of negative outcomes, including impaired cognitive performance, mood disturbances, and decreased ability to cope with stressors. When someone is not getting enough sleep, their overall functioning—both mentally and physically—can deteriorate. This can manifest as fatigue, difficulties with concentration, and an increased risk of anxiety and depression. By expressing her concern about the impact of poor sleep on her overall functioning, Tina highlights the interconnectedness of sleep, mental health, and daily performance, emphasizing the need for healthy sleep practices to maintain mental wellness.