Modern Hunter Gatherers sleep 6-7 hours per night

5.7-7.1 hours according to the study. They were in bed for 6.9-8.5 hours.

  * Sleep efficiency was between 81% and 86%, similar to that in industrial populations.
  * Naps longer than 15 minutes were uncommon, particularly in winter
  * sleep was generally initiated during a period of falling ambient temperature
  * Less than 3% reported sleep onset/offset problems occurring more than once a year

Note the last point: although sleep duration may not be greater in hunter gatherers, there may be a difference in quality.