<qa>  What is the pre-treatment assessment period?A research staff member will ask each sub-study subject two questions about how much the subject agrees with certain statements about hisher sleep, as well as two questions about how confident the subject is about carrying our certain sleep behaviors. These questions will be asked during the pre-treatment assessment period, 4-week assessment period, post-treatment assessment period, and the assessment period that takes place 3 months following the end of treatment. 