To feel rested when you wake up, go to bed at this exact time : TreeHugger


Instead of thinking about how many hours to sleep, working with sleep cycles could be the key to a restful night.
So here’s the sleepy conundrum. The Mayo Clinic offers a general recommendation of 7 to 9 hours of sleep per night for adults; which perfectly straddles that 8-hours goal that many of us know. According to the National Sleep Foundation’s Sleep Health Index, Americans report sleeping an average of 7 hours and 36 minutes a night. Yet despite getting enough sleep, 35 percent of Americans report their sleep quality as poor and many (many) are the complaints of waking up not feeling refreshed.

Could it be that striving for a set amount of hours is the wrong approach? As it turns out, research is beginning to suggest that, as The Telegraph points out, “we should forget about counting how many hours sleep we’re getting – and instead start thinking about sleep according to the cycles it works in.”

And I have to say, from experience this resonates. I have had plenty of nights with enough sleep – and even more sleep than usual – only to wake up groggy beyond reason; while other nights the sleep is scant but I don’t feel wretched. Likewise, a nap that’s more than 20 minutes leaves me wrecked for hours; the dreaded “sleep inertia.”

Author and sleep expert Dr. Laura Lefkowitz explains it like this: “The brain has a pattern of sleep. It’s not like you just fall asleep and hour one is the same as hours two and three and five and nine. It goes through cycles. Within each there is what we call non-REM sleep, and then REM sleep.”

Each cycle lasts for around 90 minutes, and disrupting the cycle can affect how you feel when you wake up. The goal is to wake at the end of a sleep cycle, when we’re in light sleep and the body and brain wake up most easily. Waking up in the midst of a deep sleep cycle can wreak havoc on your feelings of restfulness.

Now you may be asking, how does one manage to wake up at the end of a sleep cycle? The answer is to go to bed at the right time, like, to the minute, according to a new on-line sleep calculator. The tool works backwards from your wake-up time to figure out the optimal time to go to bed; for example, for my 5:50 a.m. wake-up time, I should aim for 8:36 p.m., 10:06 p.m., 11:36 pm or 1:06 p.m. (And falling-asleep time is factored in there.) Conversely, if you use the calculator when you’re tired and about to go to sleep, it will advise at what time to set your alarm.

Could the silver bullet for sleep woes be as simple as this? Sleeping in tidy chunks of 90-minute phases? There’s only one way to find out: try the calculator.
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4 comments on “To feel rested when you wake up, go to bed at this exact time : TreeHugger

  1. Sleep cycles are slightly different in length so different people must find their own exact rules. I always read that 20 min or 1 hr naps are good. Also 4 x sleep cycle (6 hrs) plus 1 hr to be equivalent to 8 hrs. Noise from overcrowding and disrespectful neighbors has an impact on some peoples sleep, but that is not pc to say. They are admitting 24/7 noise is a problem in Europe but too late. Also weather, eating time, for some people, as well as factors in the other sleep article. Peace of mind too.

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        • Sorry it took me so long to get back to you on Thursday evening I was on Alex Jones Inforers sight and I was going to post out some information about Facebook and I don’t know what I did but all of a sudden the screen froze up and some information came up.. telling me that if I didn’t hit okay then I was going to lose everything on my computer, so I had to shut everything down, then on Friday when I went to start up, it showed up again! So I had to really do some major cleaning!!

          Anyway….back to the conversation… I’ve always been that way, when I was younger it was about 5 to 6 hours… I always seem to have energy , some days it gets to me… but then I sleep that night and I feel good again with a lot of energy, the only trouble is the following night I’m awake until 4 o’clock in the morning and sometimes I don’t sleep at all and I’m fine all day long about 4 o’clock I do like to take a break but I never nap. Then I go back to my normal 4 to 5 hours of sleep.

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