MOTILITY OF SCHOOL CHILDREN DURING SLEEP

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Abstract
A new method for studying sleep motility of a number of subjects simultaneously is described. A study was made with this instrument of the sleep motility of school children between the ages of 9 and 14 yrs. The total length of time spent in motion during 9 hrs. in bed amounted to less than 5 mins. The first 1/2 hr. was the most active period, doubtless because children ordinarily do not fall asleep immediately upon going to bed. From the 2d hr. onward there was a gradual increase in motility which reached; its highest point in the last hr. Both as regards the total duration of activity during sleep and the gradual increase in activity throughout the night, the sleep motility of the children in these expts. was the same as that of the adults reported by Kleitman and his associates. No sex difference was observed in sleep motility. The difference between the activity of boys and girls of the same age amounted to only 14 secs.

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