05421569 - This full text paper was peer reviewed at the...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
The development of a system for sleep care and its applications Ken-ichi Kameyama, Takuji Suzuki, Kazushige Ouchi and Akihisa Moriya Corporate R&D Center, Toshiba Corp., Kawasaki, Kanagawa, Japan This paper describes a new sleep monitoring system for home use. The basic system consists of a wearable physiological sensor and the PC software for analyzing sleep quality from user’s wrist motion and heart rate variability. Different from a conventional sleep monitoring device used in a hospital, the sensor is so small and easy-to-use that a normal person can use it at home. This means that the system is useful not only for a sleep specialist who wants to check his/her patient's daily sleep pattern, but also is useful for self-care. The concepts of the tele-care system and the real-time control of electric appliances for creating better sleep environment are also mentioned. Index Terms —Daily sleep care, sleep monitoring, wearable sensor, control of electrical appliances. I. INTRODUCTION In recent years, many people are suffering from sleep disorder caused by mental stress, irregular life style or shift work. But it is not easy to say the quality of sleep because deep sleep is not always good sleep, and also shallow sleep is not always bad sleep. For example, it is natural that you can not have good night sleep because of jet lag. But you might have some problems in your health if you are always sleepy in the daytime over one month. Therefore, it is important for a doctor to check his/her patient’s sleep habits for several days in order to diagnose and cure his/her sleep disorder properly. Or it is necessary for a person to check his/her own sleep habits and to change his/her life style (self-care). However, there is no good system to record and analyze daily sleep. For example, most of the medical sleep sensor like a polysomnography (PSG) is for recording brain activity data of only one or two nights, not for recording sleep habits. This is because a PSG has brain wave sensors which are too difficult for a normal person to deal it at home. A doctor learns patient's sleep habits from examining in an interview, but it is not always correct. A simple and easy-to-use sleep monitoring system which can be used in home is strongly desired in order to get objective data on sleep habits. In order to develop such a system, we have created a wrist- watch-shaped physiological sensor which monitors user’s wrist motion and pulse wave interval. The sensor has been made small and easy to use because wrist motion and pulse wave can be easily measured compared to the brain wave. We have also developed the algorithm for computing the quality of sleep from these physiological data. Although sleep is a kind of brain activity and our sensor can not directly measure it, the output of our algorithm is close to medically evaluated sleep quality. We did dozens of comparison experiments and found that its accuracy was about 75% on the average. The value of the accuracy is enough for assessing normal person’s
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/15/2011 for the course EGN 6640 taught by Professor Eriksander during the Fall '11 term at University of Florida.

Page1 / 4

05421569 - This full text paper was peer reviewed at the...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online