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Described is a system including a sensor and a processing arrangement. The sensor measures data corresponding to a patient's breathing patterns. The processing arrangement analyzes the breathing patterns to determine whether the breathing patterns are indicative of a REM sleep state. In another embo

Described is a system including a sensor and a processing arrangement. The sensor measures data corresponding to a patient's breathing patterns. The processing arrangement analyzes the breathing patterns to determine whether the breathing patterns are indicative of a REM sleep state. In another embodiment, the processing arrangement analyzes the breathing patterns to determine whether the breathing patterns are indicative of one of the following states: (i) a wake state and (ii) a sleep state. In another embodiment, a neural network analyzes the data to determine whether the breathing patterns are indicative of one of the following states: (i) a REM sleep state, (ii) a wake state and (iii) a sleep state. In another embodiment, the processing arrangement analyzes the data to determine whether the breathing pattern is indicative of an arousal.

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1. A system, comprising: a flow sensor provided in an airflow path and measuring data corresponding to a patient's breathing patterns; anda processing arrangement configured to analyze the breathing patterns to determine whether the breathing patterns are indicative of a troubled wakefulness state;

1. A system, comprising: a flow sensor provided in an airflow path and measuring data corresponding to a patient's breathing patterns; anda processing arrangement configured to analyze the breathing patterns to determine whether the breathing patterns are indicative of a troubled wakefulness state; anda generator configured to supply an airflow to an airway of the patient and to reduce a pressure of the airflow supplied to an airway of the patient from a first pressure to a second pressure when the processing arrangement determines that the breathing patterns are indicative of the troubled wakefulness state, the second pressure being lower than the first pressure. 2. The system according to claim 1, wherein the second pressure is zero. 3. The system according to claim 1, further comprising: a mask coupled to the generator covering at least one of a nose and a mouth of the patient. 4. The system according to claim 3, further comprising: a venting arrangement coupled to the mask preventing re-breathing of exhaled gas. 5. The system according to claim 1, wherein the breathing patterns that are indicative of the troubled wakeful state comprise one or more patterns selected from the group consisting of (a) pure mouth breathing, (b) erratic large breaths with varying inspiratory times, and (c) irregularity of intervals between breaths. 6. The system according to claim 5 wherein the erratic large breaths are about 3-5 seconds long. 7. A system, comprising: a flow sensor provided in an airflow path and measuring data corresponding to a patient's breathing patterns; anda processing arrangement configured to analyze the breathing patterns to determine to which of the following states the detected breathing pattern is indicative: (i) a REM sleep state, (ii) a non-troubled wake state, (iii) a non-REM sleep state and (iv) a troubled wakefulness state; anda generator configured to supply an airflow to an airway of the patient and to adjust a pressure of the airflow supplied to an airway of the patient as a function of a state determined by the processing arrangement. 8. The system according to claim 7, wherein the breathing patterns that are indicative of state (i) comprise one or more patterns selected from the group consisting of (a) an absence of large breaths, (b) a high respiratory rate, (c) a low flow rate, and (d) a cluster of small breaths. 9. The system according to claim 7, further comprising: a mask coupled to the generator covering at least one of a nose and a mouth of the patient. 10. The system according to claim 9, further comprising: a venting arrangement coupled to the mask preventing re-breathing of exhaled gas. 11. The system according to claim 7, wherein, when the processing arrangement determines that the breathing patterns are indicative of state (iv), the processing arrangement decreases the pressure of the airflow supplied to the airway of the patient from a first pressure to a second pressure, the second pressure being lower than the first pressure. 12. The system according to claim 11, wherein the second pressure is zero. 13. The system according to claim 7, wherein, when the processing arrangement determines that the breathing patterns are indicative of state (i), the processing arrangement increases the pressure of the airflow supplied to the patient from the first pressure to a third pressure, the third pressure being greater than the first pressure. 14. The system according to claim 7, wherein the processing arrangement determines a time period during which the breathing patterns are indicative of state (i). 15. The system according to claim 7, wherein the breathing patterns that are indicative of state (iv) comprise one or more patterns selected from the group consisting of (a) pure mouth breathing, (b) erratic large breaths with varying inspiratory times, and (c) irregularity of intervals between breaths. 16. The system according to claim 15, wherein the erratic large breaths are about 3-5 seconds long.