Did we sleep?

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Did we sleep?
DID WE SLEEP?
But everyone seems to know that they have slept, even though there is a blank in the memory during NREM sleep. How do we know that we have slept? We depend on two cues:
* Dreams, which are an inside cue
* The clock, which is an outside cue
When we wake from our dreams, we can recall the contents of the dream and we know that the dream is part of our normal sleep. Hence we are convinced that we have in fact slept There are people who need to recall that they have dreamt before they are convinced that they have slept Without dreams as a marker in the blank space in the NREM sleep, we are unable to give an account of what follows after the thought of 'the wonderful lunch'.
The other cue is the clock. We look at the clock before we go to bed; it is 10.30 p.m. at night. We may wake up and go to the toilet, it is 2 a.m. When we wake up again and look at the clock it is 7 a.m. in the morning. Hence we are convinced that we must have slept about eight hours. Have you ever had the experience of the clock, for some mechanical reason, stopping at 6 a.m. in the morning, letting you believe that there was still an hour to sleep before your normal wake-up time. You go back to sleep, and later discover that the clock never went to 7 a.m.; the clock was not working! Too late, it was already 9 a.m. At night we are depending on the clock as an external cue, for during the NREM sleep our mind is blank.
A number of people constantly complain of chronic insomnia and always seek treatment. When they are placed in the sleep laboratory, however, the EEG and other recordings all confirm that they have been sleeping soundly. Yet, when they wake up, they insist that they have not slept at all. These people cannot remember any dreams, and hence they do not have the inside cue to convince themselves that they have in fact been sleeping.
Most of us believe that we do in fact sleep. But this belief is not easily held in the absence of the dream experience or a visible clock. Those people who believe they do not sleep at night do so because they cannot experience sleep itself. All they can experience is the distress they feel while awake. The blank period of NREM sleep is very important in understanding insomnia and in overcoming it. People who suffer from insomnia nearly always underestimate the amount of sleep they really have. This is because the individual's own view of how much sleep he has is always inaccurate, as no one can recall how much NREM sleep he actually has.

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