a. The following night, I went to bed earlier, and I felt much better. I could pay attention during lessons, and I had more energy all day.
b. Lately, I have been learning about why sleep is so important, especially for teenagers like US.
c. I think it would be fun to talk about it. Write back soon!
d. Dear Alex, I hope you're doing well! I wanted to tell you about our sleep.
e. Now, I feel so much better! Do you get enough sleep?
f. On the first night, I stayed up late watching a movie, and the next day, I couldn’t focus on class, and I was so grumpy.