Although the National Sleep Foundation recommends seven to nine hours of sleep each night for everyone aged 18 to 64, 35.7% of Americans still got six or fewer hours of rest on a nightly basis, which constitutes "inadequate sleep." And some state residents were more likely to get inadequate sleep than others.

In a new study, the team at The Sleep Judge analyzed the CDC's Behavioral Risk Factor Surveillance System to uncover the states that suffer the most from poor sleep and the possible reasons why. Unfortunately, Tennessee stood out:

• Tennessee ranks the No. 4 state for inadequate rest, defined as 6 or fewer hours of sleep nightly

• Specifically, 40% of Tennessee residents report inadequate sleep regularly

• Relationship status, income, and employment impact sleep--those separated (45.9%), with an income of less than $10K (41.2%) and who are unable to work (50.1%) sleep the worst

• Additionally, poor physical health (48%) and poor mental health (54.7%) are a detriment to a good night's rest

The average adult is recommended 7-9 hours of sleep a night but 35.7% of Americans still get six or fewer hours of rest on a nightly basis with each state seeing its own unique sleep patterns.