I think I will give her some advice for Mary to improve her sleep, performance and energy levels: she aims to establish a healthy sleep routine such as setting a fixed bedtime and wake-up time at the same times every day. This helps regulate her internal body clock. She has to avoid the screen before bed for an hour and she can relax by reading a book, listening to calming music, or meditating for a while before bed. She can create a sleep-friendly environment. For instance, let the light dim or turn it off and she can use a nightlight or white noise if needed so that can sign her body is it time to rest. Limit stimulants and unhealthy habits such as avoiding caffeine in the evening, she should not consume coffee or tea after the afternoon. Turn off notifications so it can prevent distraction and ensure she is not tempted to use her phone. I think this is the most important thing is Marry needs to follow this plan consistently, she can improve her sleep quality, feel more energized, and perform in school.