It seems like you might be looking for a way to complete or meld your sentences regarding the impact of lack of sleep on students, particularly teens. Here's a suggested revision that combines your thoughts more cohesively:
"Lack of sleep affects students' ability to be alert, pay attention, solve problems, deal with stress, and retain information. Additionally, teens who do not get enough sleep are at increased risk for drowsy driving, further compromising their safety and cognitive functioning."
Feel free to edit this as you see fit!