The real question though is whether this affects their memory, reflexes and immune system. Former is reasonably simple to test, latter requires a longer study.
The problem is placebo control, which of impossible, and required monitoring to detect microsleeps and oversleeping.<p>You would need a control group, group with day, forced 8h sleep both biphasic and monophasic, and a group on this fancy multiphasic schedule.<p>Expensive to run.