Does splitting sleep improve long-term memory in chronically sleep deprived adolescents?

Study Protocol. The study began with 2 baseline nights (B1–B2) of 9？h nocturnal sleep opportunity followed by the first school week period, during which one group were provided with a 6.5？h nocturnal sleep opportunity (00:15–06:45) and the other group 5？h nocturnal sleep opportunity (01:00–06:00) with a 1.5？h afternoon nap (14:00–15:30). This was followed by a “weekend” recovery period of 9？h nocturnal sleep opportunity (R11–R12). The second weekday (SR21–SR23) and weekend recovery period (R21–R22) of the experiment matched the first, except with 3-days of manipulation rather than 5. Picture encoding began at the end of the first manipulation period (SR15) and was tested after two nights of recovery (R12). Learning of factual knowledge took place in the morning and afternoon on each weekday of the second manipulation period (SR21–SR23) and was tested after one night of weekend recovery sleep (R21