Application US20180263553

SYSTEM AND METHOD FOR CHARACTERIZING THE SLEEP OF AN INDIVIDUAL
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US20180263553

1. System for characterization of sleep of an individual, the system for characterization comprising: (6) (5)

a measuring device adapted to measure a brain activity signal representative of the brain waves,

an electronic central unit adapted to:

identify, in a range of frequencies from 9 to 16 Hz, at least one reduced range of sleep spindles specific to the individual, the reduced range of sleep spindles comprising frequencies of brain waves of the sleeping individual having an amplitude greater than 15 μV and a duration comprised between 0.5 second and 2 seconds,

compare at least one parameter of the brain activity signal of the awake individual in the range of frequencies corresponding to the reduced range of sleep spindles, to a threshold,

a communication interface linked to the central unit and adapted to emit a warning signal perceptible to the individual when the parameter of the brain activity signal in the range of frequencies corresponding to the reduced range of sleep spindles exceeds the threshold.

2. The system for characterization according to claim 1, wherein, in order to identify the reduced range of sleep spindles, the electronic central unit is adapted to detect, in the range of frequencies from 9 to 16 Hz of the brain activity signal of the sleeping individual, brain waves of the sleeping individual having an amplitude greater than 15 μV and a duration comprised between 0.5 second and 2 seconds. (0)

3. The system for characterization according to claim 1, wherein, in order to identify the reduced range of sleep spindles, the electronic central unit is adapted to identify beforehand an individual frequency of an alpha peak of the individual, said frequency being defined as a ratio of a weighted sum of spectral powers in a window of frequencies comprised between 7 and 13 Hz, to a total spectral power of alpha waves in the window, the spectral powers of the weighted sum being weighted by the frequencies of the window: (0) (1)

4. The system for characterization according to claim 1, wherein the measuring device comprises: (2) (2)

a support intended to be placed on the head of the individual, and

at least one reference electrode, one ground electrode and one measuring electrode connected to the central unit and arranged on the support for measuring a difference in electric potential between the reference, ground and measuring electrodes as brain activity signal.

5. The system for characterization according to claim 4, wherein the central unit is mounted on the support and is adapted to amplify the brain activity signal. (1) (0)

7. The system for characterization according to claim 4, wherein the reference, ground and measuring electrodes are dry electrodes. (0)

8. The system for characterization according to claim 1, wherein the communication interface is manually portable by the individual. (0)

9. The system for characterization according to claim 1, wherein the central unit is adapted to modify the threshold and/or a period of time above the threshold. (0)

10. The system for characterization according to claim 1, wherein the parameter of the brain activity signal is selected among an amplitude and a density. (0)

11. Method for characterization of sleep of an individual comprising the steps consisting in: (7) (3)

measuring a brain activity signal representative of brain waves.

identifying, in a range of frequencies from 9 to 16 Hz, at least one reduced range of sleep spindles specific to the individual, the reduced range of sleep spindles comprising frequencies of brain waves of the sleeping individual having an amplitude greater than 15 μV and a duration comprised between 0.5 second and 2 seconds,

comparing at least one parameter of the brain activity signal of the awake individual in the range of frequencies corresponding to the reduced range of sleep spindles, to a threshold, and emitting a warning signal perceptible to the individual when the parameter of the brain activity signal in the range of frequencies corresponding to the reduced range of sleep spindles exceeds the threshold.

12. The method for characterization according to claim 11, wherein the step consisting in identifying the reduced range of sleep spindles, comprises detecting, in the range of frequencies from 9 to 16 Hz of the brain activity signal of the sleeping individual, brain waves of the sleeping individual having an amplitude greater than 15 μV and a duration comprised between 0.5 second and 2 seconds, (0)

13. The method for characterization according to claim 11, wherein the step consisting in identifying the reduced range of sleep spindles comprises a prior identification of an individual frequency of an alpha peak of the individual, said frequency being defined as a ratio of a weighted sum of spectral powers in a window of frequencies comprised between 7 and 13 Hz, to a total spectral power of the alpha waves in the window, the spectral powers of the weighted sum being weighted by the frequencies of the window: (0) (1)

14. The method for characterization according to claim 11, wherein the step consisting in measuring the brain activity signal comprises a measurement of a difference in electric potential between reference, ground and measuring electrodes. (0)

15. The method for characterization according to claim 11, providing: (0) (2)

16. The method for characterization according to claim 11, providing: (0) (2)

17. The method for characterization according to claim 11, providing, during the step consisting in comparing the parameter of the brain activity signal to the threshold, modification of the threshold. (0)

18. The method for characterization according to claim 11, providing, during the step consisting in comparing the parameter of the brain activity signal to the threshold, selection of the parameter among an amplitude and a density. (0)

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Application US20180263553

SYSTEM AND METHOD FOR CHARACTERIZING THE SLEEP OF AN INDIVIDUAL

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