Dumbledore was lengthening his circadian cycle by 2 hours per day. But then Harry was using the Time-Turner to go back 6 hours per day. That leads to a net of the sleep schedule going back 4 hours per day, so I think Sinclair was taking all the above into account.
Harry’s circadian rhythm was artificially altered; at least if Dumbledore is telling the truth.
Dumbledore was lengthening his circadian cycle by 2 hours per day. But then Harry was using the Time-Turner to go back 6 hours per day. That leads to a net of the sleep schedule going back 4 hours per day, so I think Sinclair was taking all the above into account.
yeah