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An adult on average should sleep for about 7-9 hours everyday. According to national sleep foundation:
> The National Sleep Foundation released the results of a world-class study that took more than two years of research to complete – an update to our most-cited guidelines on how much sleep you really need at each age. You can read theresearch paper published in Sleep Health.
> “The NSF has committed to regularly reviewing and providing scientifically rigorous recommendations,” says Max Hirshkowitz, PhD, Chair of the National Sleep Foundation Scientific Advisory Council. “The public can be confident that these recommendations represent the best guidance for sleep duration and health.”
> A new range, “may be appropriate,” has been added to acknowledge the individual variability in appropriate sleep durations. The recommendations now define times as either (a) recommended; (b) may be appropriate for some individuals; or (c) not recommended.
> The panel revised the recommended sleep ranges for all six children and teen age groups. A summary of the new recommendations includes:
> https://sleepfoundation.org/excessivesleepiness/content/how-much-sleep-do-we-really-need-0
As you can see, adults of 18 years to 64 years should sleep for 7-9 hours.
