LitCharts assigns a color and icon to each theme in Looking for Alaska, which you can use to track the themes throughout the work.
How to Live and Die
Mystery and the Unknown
Loyalty and Forgiveness
Memory and Memorial
Identity
Mischief
Summary
Analysis
Everyone wakes up hung-over the next morning, but Alaska is particularly sick. Miles suggests that she should drink less, and she tells him that he doesn’t get the fact that she is “a deeply unhappy person.” Everyone checks back in with the Eagle, who doesn’t seem to suspect anything. Miles sleeps for the rest of the day, but, in retrospect, he realizes that he should have taken as much advantage of the day as possible.
Alaska indicates to her friends that she isn’t doing well many times, but no one ever does anything about it. This is largely because Alaska pushes away anyone who tries to get close to her, but also because no one can figure out when she is being serious. She is too mysterious for her own good.