Note that the "getting lost in thought" happened when I slept 8 hours not 4. I think it just came to me taking hours upon hours of very similar tasks.
>I was extremely bored in the last 2 days of taking control measurements and sometimes got distracted and lost in thought, which resulted in me getting 3 and 4 lapses per session (as can be seen on Figure 1). I do not believe that these lapses represent my lack of alertness. ...
>The last low control score on the verbal section is a result of me becoming very bored with taking the SAT 5 days in a row, getting lost in thought for 10 minutes, and having to rush.
I will continue to experiment with sleep, mostly for myself :) and I'm planning to test memory and skill acquisition next time -- these are the two things people say are affected the most, so I'll try to figure out if that is true for me.