Why does a day sometimes start the night before? For example, in religions, if tomorrow were a fasting day, then the fast would start at nightfall today. Also, in sports, your coach will often tell you what you eat the night before and how you sleep the night before are very important. Folks often arrive to far away meetings the night before to “be fresh” the next morning. Another example: Christmas EVE. Evenings are the precursor to days.

Recently, a group of researchers led by Nobel-prize winner Daniel Kahnemann has been studying people’s happiness in a very simple-to-grasp way: people were asked to write down at the end of each day which activities they enjoyed and which they didn’t (as you can imagine, “intimate relations” was highest and commuting was lowest on the list). Most interestingly, “Events such as a poor night’s sleep had a large impact on how people felt about what they did the following day,” says this study summary.

This reseach appeared in the Dec 3 issue of Science Magazine (abstract here). The method of asking to sum up the enjoyments of the day is called the Day Reconstruction Method, and the researchers asked about 900 women in Texas to complete these forms. Because the data was for women only, the researchers do not claim that it’s generalizable to the entire population.

The fascinating book Sleep Thieves talks in detail about the physical harm to the body that happens when deprived of sleep. The author Stanley Coren talks about people being more accident-prone and increasingly exhausted. One of the more interesting parts of the book is when Coren describes the fact that sleeping less one night and trying to “catch up” the next night or few nights does not get your body back into its balance: there is something lost when sleep is lost.

Today we’ve talked about why sleep is so important. And tomorrow, we’ll talk about how to get more full, healthy sleep.

Some fun thoughts on sleep:

  • CNN reports that stock strategist James Montier recommend in ’04 that people focus less on stocks and focus more on things that really make them happy – love, sex, exercise and sleep.
  • “Sleep in the City” study (summary here) that finds that people get the best sleep in cities including Minneapolis , Detroit, Anaheim, San Diego, raleigh, DC, Chicago, Boston, and Austin, and the worst sleep in cities including Detroit, Cleveland, Hashville, Cincinnatti, New Orleans, NY, Las Vegas, Miami, San Francisco.
  • There is a recent study in the UK that looked for what gives people “a sense of well-being”. One of the results is that “a good night’s sleep [is]… linked to contentment” (article here)


  1. Lila
    Posted Thursday January 11, 2007 at 4:12 am | Permalink

    Hahah, obviously I need tomorrow’s post today. Ah, insomnia.

  2. Posted Thursday January 11, 2007 at 8:13 am | Permalink

    Lila, that’s hilarious! I bet you’ll disagree a lot with today’s post, but I’d like to see what you think.

  3. Lila
    Posted Monday January 15, 2007 at 2:17 am | Permalink

    wait, i’m confused. Which post did you think I’d disagree with, and why?

    I totally agree that missing sleep causes all sorts of problems.

  4. Dana
    Posted Thursday January 18, 2007 at 10:54 am | Permalink

    senia have you read anything about what’s the ideal amount? i’ve heard between 8-9? I can’t figure out what my ideal is….maybe you discuss it somewhere i haven’t seen yet…thanks!

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