If you wake at 7:10am, you should go to bed at 11:10pm or earlier. That is eight hours of sleep ... you could 'survive' only only 7 hours of sleep (bed at 12:10am) but your performance would go slowly 'downhill' over time if you did this regularly. You need at least 4 periods of REM sleep per night, not 2 ... you'd get confused with only two every night for any period of time.
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