This is one of the more insane articles I've read.
'Delayed bedtime group' - great, but were they delayed by one minute, one hour, or 4 hours? How much sleep did the delayed bedtime group get? It seems highly relevant to the article.
'Delayed bedtime group' - great, but were they delayed by one minute, one hour, or 4 hours? How much sleep did the delayed bedtime group get? It seems highly relevant to the article.
The delayed amount was not a fixed amount but calibrated to another subject's total sleep, so you can't say exactly how much each one was delayed by overall:
"RSO During Nights 2–4 of RSO, subjects’ total sleep opportu- nity period was restricted and yoked to the amount of total sleep time achieved by a matched subject in the FA group. This was accomplished by delaying the RSO subject’s bedtime and keeping a fixed wake time. For example, if an FA subject achieved 210 min of total sleep time on Night 2, the yoked RSO subject would be provided a 210-min opportunity for undisturbed sleep (bedtime 03:30, wake time 07:00) on Night 2. Subjects in the RSO condition were monitored polysomno- graphically for an entire 8-h period."