Friday, January 29, 2010

Conclusion

Though my original intent with this blog was to compare different professional researchers' sleep-studies, I found it a lot more exciting to conduct my own study, albeit very informal. I think the background information I read on sleep and sleep studies first, though, helped me better understand how the sleep cycle works.


My conclusion is sadly predictable and not about to earn me the Nobel Prize. Sometimes, though, the most obvious answer...is not always obvious to everyone. Through my personal experiences in the past few weeks, I have found that sleeping three hours or less per night increases one's risk of stress burnout, and is not advisable for a healthy lifestyle. All the same, sleeping for too long makes one tired and unmotivated, so this too should be avoided.

Therefore, we have to find that middle ground. The right amount of sleep for someone varies from person to person, so it probably takes a little experimentation to find the optimal amount of sleep that leaves one feeling refreshed and energized at the same time.

As for me, I will return to Week 2's sleeping habits as soon as possible, and I may just keep trying to sleep that Magic 7-hour night. Maybe there is something scientifically special about it, or maybe I just love the number seven.

Hope you enjoyed this blog, and I hope it inspires you to take a look at your own sleeping habits, like it inspired me to. Just don't try out week 3. I strongly advise against it!


Happy sleeping!

Thursday, January 28, 2010

Three-Week Self-Study

Hi. I'm back. That seven hours did not quite work out. Ironically, I have spent so much time over the past few weeks doing hours of homework that I have not had time to sleep enough, much less work on this blog (which I finished purely because I believe in finishing what I start!). I admit it. I have spent next to no time sleeping or researching, and the only results I have about the effects of different sleep habits are my mental self-inventories. I therefore offer myself as a subject for science.


Week 1
I began this blog shortly after a Christmas Break of sleeping for an exorbitant amount of time, and then sleeping some more. How did that work out for me?
  • energy level - low
After sleeping around 12-13 hours a night, I found myself waking up more sleepy and languid than when I went to bed the night before. Often I would wake up in morning after 6 or 7 hours of sleep, but still feel kind of sleepy, so then I would turn over and go back to sleep. And wake up again. And sleep some more. Finally, I would reach the point where I simply could not fall back asleep, but I felt too tired to do anything, so I would lie there and stare at the ceiling.
  • productivity - lower
With decreased energy level comes decreased productivity. After sleeping for such a long period of time, not only did I have less energy to accomplish anything, but I also had less time, which was lost to sleeping excessively and staring at the ceiling.
  • mood - relaxed
A definite pro of sleeping so much was the relaxed mood I had throughout the break. Not only did I not feel like doing anything, I didn't worry about anything either.


So now you have the effects of sleeping too much for a 17-year-old girl. What are the effects of sleeping too little?


Week 3
Now that school has started, I am experiencing my uncomfortable sleep pattern once again! This week alone, my sleep times have been three hours on Sunday, three hours on Monday, three hours on Tuesday, and two hours on Wednesday night. Here are the consequences:
  • energy level - fluctuates between extreme hyperactivity and utter exhaustion
After a two or three-hour night, I wake up active and energetic, and once I have breakfast I can keep going for another three hours before I'm overcome with an overpowering compulsion to fall asleep (which is a very, very bad idea when in AP English or AP Calculus class). A mid-morning snack can keep me going for another couple of hours, but by noon, it takes every bit of my willpower to stay awake, especially if I run out of snacks to give me energy. Getting up and moving around helps to get the energy flowing again, but sitting down at a desk is not conducive to staying awake after having gotten so little sleep.
  • productivity - high
Because I am more productive at night, I get a lot more work done with the extra hours at night, plus I am awake in school all day working. However, it is more difficult to think clearly having had only two or three hours of sleep, so a lot more effort is required to do tasks that would probably be simpler if I was well-rested. Memorizing is difficult, and in fact, so is basic reading. This morning while reviewing for an AP Government quiz, I had to read the same few lines over five times before finally understanding what I was reading. I knew the material on the page, but my brain was too tired to let the information sink in.
  • mood - volatile
My mood these days is exactly what I typed above. Even if I am bubbly and happy one moment, I can find myself tense, strained, and stressed the next, with my nerves ever stretched to their limit. While I act normally for the most part, there are moments throughout the day where I feel like the weight of the world is crushing my spirits, and other moments where I find myself giggling or laughing for no reason.

As I have described above, sleeping too long can make one feel more lazy than rested, and sleeping too little can have about as many benefits and risks as ice skating. Not enough sleep can upset a person's emotional balance and slow-down his or her mental processes, even if it comes with temporary bursts of energy.

Now, if one was reading carefully, one would notice that I have written about "Week 1" of my sleeping habits, and "Week 3." Where is Week 2? Haha, don't worry, I have information on it, as well.


Week 2
For one blissful week between Christmas Break and my current hectic week, I had the first week of school, which was defined by relatively light homework, early bedtime hours, and early waking hours. On average, I slept about 6 hours every night, and ended up with these results:
  • energy level - moderate
While I was not bouncing off the walls with energy, I definitely was not tired all the time, which was a nice feeling. I had enough energy to do everything I had to throughout the day, and I was not falling asleep every three hours, either.
  • productivity - moderate
I did not have an excessive amount of schoolwork during this week, so while I was productive enough to complete all of it, I preferred going to sleep earlier rather than staying up late filling more scholarship application.
  • mood - stable
Again, no excessive hyperactivity or tension, just the contentment of knowing I was getting enough sleep and I should enjoy it as much as possible before the real work started. I was definitely thinking more clearly (my test grades were higher during week 2 than during week 3), and I was calmer most of the time, less on edge.

If it helps with visualization any, here's a graph I made!



As you can see, Week One has low energy, productivity, and mood levels, Week Two has stable and even energy, productivity, and mood levels, and Week Three has a low energy level, high productivity, and a high mood (as in nervous and strained).

So there you have it: weeks one through three of my personal sleep study! Now I'll move on to wrap this all up in the conclusion post.

Saturday, January 9, 2010

You Don't Need 8 Hours

I hear from a reliable source (specifically Daniel Kripke, the co-director of research at the Scripps Sleep Center in La Jolla, California) that WE DO NOT NEED 8 HOURS OF SLEEP. *gasp* Haven't people been telling us for years that 8 is the magic number of hours we need to sleep each night? Apparently, it is no longer.


According to Kripke, "people who sleep between 6.5 hours and 7.5 hours a night, as they report, live the longest. And people who sleep 8 hours or more, or less than 6.5 hours, they don't live quite as long." Kripke essentially says here that sleeping too long is just as bad, or even worse, than sleeping too little. However, even though people who sleep 6.5-7.5 hours seem to live longer, Kripke admits that "we don't know the reasons."

A check with the National Sleep Foundation, which recommends 8.5-9.25 hours of sleep for teens aged 11-17, and 7-9 hours for adults, leaves me wondering whether Kripke knows what he's talking about or the National Sleep Foundation website is outdated. Who is right?

As it turns out, that quick glance at the chart is a bit misleading. In the actual article preceding the chart, the Sleep Foundation also says "healthy adults have a basal sleep need of seven to eight hours of every night." The key word here is basal. Apparently researchers define basal sleep need as "the amount of sleep our bodies need on a regular basis for optimal performance," and sleep debt as "the accumulated sleep that is lost to poor sleep habits, sickness, awakenings," etc. So even if someone sleeps the correct amount of time for their basal sleep need, one still needs to make up for sleep he or she has lost on other nights. Not to mention, basal sleep need differs among individuals, so there is no "magic number" of sleep that applies to everyone.

In addition, there are also circadian dips to deal with, different times when people are programmed to feel more sleepy. My circadian dip usually comes during 2nd block at school (9 am - 10:30 am) no matter what class I have. This turns out to be quite inconvenient, especially because most standardized tests, like the SAT and Advanced Placement exams, are given in the morning.

Ironically, this article, too, refers to the research by Danial Kripke, and his fellow researcher Shawn Youngstedt. After analyzing American Cancer Society surveys of 1 million adults, they found that people who got 7 hours of sleep had a lower mortality rate. So, does this mean that sleeping 7 hours is healthier? Or does it just mean fewer people who slept 7 hours died? Researchers argue that sleeping too little and sleeping too much is associated with "increased morbidity (illness, accidents) and mortality (death)." However, is this a cause-and-effect relationship, or merely a correlation?

According to Kristen L. Knutson, PhD, Deparment of Health Studies, University of Chicago, "There is laboratory evidence that short sleep durations of 4-5 hours have negative physiological and neurobehavioral consequences." So short amounts of sleep may be dangerous. But why?

It seems the further I research the more questions I have. As I research, maybe I'll perform my own self-study. It won't be very reliable, but it'll help me get better in touch with what I'm dealing with. Tonight I will sleep for 7 hours. And tomorrow night. We'll see how it turns out!

Introduction

It's an accepted fact that humans need sleep to survive. Still, how much sleep do people need? What are the short and long-term consequences of not sleeping enough?

As an overworked high school student, I've experienced a variety of sleep times, from the weekend 14-hour night to the weekday 5-hour night to the all too often night-before-exams 1-hour night. Sometimes, after getting little or no sleep, I find myself alert and hyper, while a long-night's sleep leaves me groggy and sluggish for part of the day; other times, these results are reversed. I find myself wondering, "Is there a pattern here? Do I really need that much sleep to function properly?"

As of today, my hypothesis is that 5 hours is enough sleep for me, a 17-year-old teenager, to wake up ready to go and to make it through the day. I may get a little slower towards mid-morning or afternoon, but I can do all right on 5 hours of sleep. Because most experts recommend 8-10 hours for my age group, I don't know what long-term consequences sleep deprivation can have, but hopefully my research will shed some light on the subject.

This blog made possible by...

Introduction
  • Me

You Don't Need 8 Hours

Three-Week Self-Study
  • Me
  • What my friends told me about my behavior during the study

Conclusion
  • Me!

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