My body somehow knows whether I have to get up for school or if I can sleep in. If I get up for school, I usually think about the dream I had last night while groggily getting ready.
If I can sleep in, I lay in bed and relax while also again, thinking about whether I dreamed. Sometimes if something lame had happened in the past days, it hits me and bums me out. If something exciting it about to or has happened I obsess on that.