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Over many years, I've found it's not so much how many total hours I sleep, as long as it's in increments of 1.5 hours. If I miss the normal bedtime, I'll struggle to line up the alarm with increments. 4.5 is way better than 5, if I can keep my eyes open that extra 30 minutes.
Like M-Six, I would never survive for long if it were regularly 4.5 though.
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