It's long been common knowledge that everyone needs 7-9 hours of sleep every night.

Now a new study says that might not be the case.

Ingrid Prueher, a sleep consultant, explained on "Fox and Friends Weekend" that people need tailored sleep strategies based on which of four sleeping patterns they fall into.

Prueher said that many people are overscheduled and are living a very busy life. When most people don't get close to the baseline 7 hours, that's when problems often arise.

She added, however, that there are some people who can actually get away with less sleep.

Prueher explained that there are four "chronotypes," or body clocks, when it comes to sleeping.

There are the well-documented "early birds" and "night owls," chronotypes 1 and 4. According to Prueher, there are two other patterns of sleep. Chronotypes 2 and 3 are a balance of early bird and night owl - going to sleep earlier than the night owl and waking later than the early bird - with 2 feeling sluggish in morning and evening while 3 has high energy levels at both times of the day.

Prueher recommended that people log their sleep and how it affects their moods throughout the day.

"Keep doing it. And make sure you set a routine for yourself," Prueher said. "Every night, try to turn off technology about an hour before you go to sleep, as well as have wind-down time."

Watch more above.