The start of the year often means a fresh start for many: getting back to daily life, building new routines, and paying closer attention to health. This is when we truly see how the holiday season can disrupt our sleep—and whether we’re really resting well even if we hit the “mandatory” eight hours.
Good news: you might not need exactly that much sleep. But here’s the catch: it’s not just about counting hours.
How Much Sleep Counts as Healthy?
Most sleep experts recommend 7 to 9 hours of sleep per night for adults—ideal for overall health and mental balance.
Research shows that consistently sleeping less than 7 hours a night can raise the risk of obesity, high blood pressure, heart disease, and other chronic issues.
Still, this is just an average—and here’s where individual differences come into play.
It’s Not Just About How Long You Sleep
Clinical psychologist Dr. Tony Cunningham says it’s a myth that healthy sleep is only about the number of hours.
“Two processes in our body determine the type and quality of sleep we get: sleep pressure and the circadian rhythm,” he told CNN.
In other words, when, how, and in what state we go to bed really matters.
What Is Sleep Pressure?
Sleep pressure, also called sleep drive, builds the longer we stay awake and gradually eases during sleep.
“It’s just like hunger: the more time passes since your last meal, the hungrier you get.”
If you go to bed too early, before enough sleep pressure has built up, you might find yourself tossing and turning.
Our Internal Clock: The Circadian Rhythm
The other key player is the circadian rhythm, our body’s internal clock that regulates wakefulness and sleepiness throughout the day.
“The circadian rhythm fluctuates during the day, sending signals that either promote sleep or support wakefulness.”
This explains the strange feeling when after extreme tiredness, you suddenly get a burst of energy:
“If you’ve ever stayed up all night and then suddenly felt more awake in the middle of the night, that’s your circadian rhythm kicking in.”
For truly restful sleep, sleep pressure and circadian rhythm need to work in harmony.
Why Wake-Up Time Matters More Than Bedtime
Surprisingly, Dr. Cunningham says the most important habit isn’t a fixed bedtime.
“One way to improve sleep quality is waking up at the same time every day. This often matters more than going to bed at the same time—because it’s not always a good idea to lie down when you’re not sleepy yet.”
Consistent wake-up times help your body set its ideal rhythm.
Does Everyone Really Need 8 Hours?
The short answer: no.
According to the expert, some people truly function best on just five to six hours of sleep—their biology and physiology simply allow it. Others need nine, ten, or even eleven hours a night.
How to Find Your Own Ideal Sleep Time
Dr. Cunningham suggests a simple experiment to learn more about yourself:
“Keep a consistent bedtime. Pick a time when you’re confident you’ll fall asleep within 20-30 minutes.”
If you can’t fall asleep, get up and do a calming, low-stimulation activity until you feel sleepy again.
Then: “Find a period in your life when you can wake up naturally, without an alarm clock.” It’s normal to sleep longer the first few days. After a few days, your body’s natural rhythm will settle in.
“You’ll know you’ve found your ideal sleep time when you wake up around the same time for three to four days in a row without external cues like light or an alarm.”
The Most Important Takeaway
Sleep isn’t a competition or a strict rulebook. What matters is waking up refreshed, energized, and mentally sharp—not just hitting the “mandatory” eight hours.
Maybe the best New Year’s resolution isn’t going to bed earlier—but finally learning to listen to your body’s signals.
