New guidelines from the National Sleep Foundation set some specific parameters on what exactly makes for a good night’s sleep, reports Business Insider.

The team behind the study provides four easy ways to tell if you slept well:

  • For most adults and kids of all ages, falling asleep in 30 minutes or less qualifies as good. For adults 65 or older, falling asleep in 60 minutes or less is good.
  • Good quality means that most adults and kids wake up for more than five minutes no more than once per night. (Older adults may do this twice.)
  • If you do wake up, it’s for 20 minutes or less. (For the over-65 crowd, 30 minutes or less.)
  • You sleep for at least 85% of the time that you’re in bed.