TesTeq;94089 said:
Bill Gates says that he sleeps 7 hours on average. Is he fooling himself?
Or maybe he isn't just an average adult?
I am not average too. I sleep 7.5 hours and feel great (not fooled).
I don't know whether any particular person is getting an optimal amount of sleep
or not, but I believe based on evidence presented in the book that currently
in industrialized society the majority of
people are getting less than an optimal amount of sleep who sleep less than 10 hours
per day, are capable of sleeping longer if they try, feel fine and believe they are
getting plenty of sleep.
I'm not saying that any particular person is fooling themself, and a person getting less than an
optimal amount of sleep without realizing it is not necessarily fooling themself, but
I think the majority of people who are fooling themselves believe they aren't fooling themselves.
Also, many people are not able to sleep longer than they do, even if they
know they're desperate for more sleep. (See the book Insomniac by Gayle Greene.)
But this raises the question: how can one know one is getting an optimal amount
of sleep? I don't have any fully satisfactory answer to this, but here are some ideas.
-- Letting the body decide:
If one provides oneself with natural conditions, including about 12 hours of darkness
per day and avoiding alarm clocks or hormone-bending pollutants etc., and one
naturally wakes up after a certain length of time each day, that may be an indication that
that's a good amount of sleep for that person. (However, the body may be expecting more than
one period of sleep per day.)
-- Taking the questionnaire in the Sleep Thieves book, which asks things like
whether you tend to fall asleep if you're on a long train or bus ride, and
many other questions.
-- Doing a test: For example, for 3 weeks sleep your usual amount; then for
3 weeks sleep 0.5 or 1 hour longer; then for 3 weeks sleep your usual amount
again. Meanwhile either just (openmindedly and without bias?) notice how you feel,
or take tests measuring
IQ, rate of making mistakes, creativity etc. For example every evening you
could write down answers to "what insights did I have today?" and after the
whole test is over see if the ones during the longer-sleep period are more numerous
or more interesting. The reason for switching twice is to control for improvements
due to learning during the test period. This test might show that more sleep is
good; but if it doesn't indicate any difference, I don't think it gives much confidence
that there isn't an important difference. You might be equally fast at solving Sudoku
but every few days have an important new insight or shift in perspective.
Or you might be thinking just as clearly but avoiding the onset of a major illness.
As I remember, in the book Coren describes when he was teaching a course and
made the students have an "extra" half-hour of sleep: they didn't believe they
needed the extra sleep, didn't want to, and generally didn't notice a difference, but
on average their marks on the course were quite a lot higher.
We haven't fully evolved to live with artificial light in the evening,
so the time at which we feel like going to sleep isn't a good indication.
Two more benefits to getting plenty of sleep:
-- increased creativity
-- better memory, especially long-term memory for the things you did or
learned the day before, including memories of having fun.