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A method of operating a device for treating sleep disordered breathing (SDB), wherein the device provides continuous positive airway pressure during sleep, includes determining whether treatment pressure at the patient interface is below a desired value, in response to the determining, increasing pr

A method of operating a device for treating sleep disordered breathing (SDB), wherein the device provides continuous positive airway pressure during sleep, includes determining whether treatment pressure at the patient interface is below a desired value, in response to the determining, increasing pressure generated by the flow generator, in response to the increasing, making a determination that the increase in flow generator pressure has resulted in less than a desired increase in treatment pressure at the patient interface, and in response to the determination, reducing or inhibiting further increase of the flow generator pressure.

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1. A method of operating a device for treating sleep disordered breathing (SDB), wherein said device provides continuous positive airway pressure during sleep, the method comprising: determining whether a treatment pressure at the patient interface is below a desired value;in response to said determ

1. A method of operating a device for treating sleep disordered breathing (SDB), wherein said device provides continuous positive airway pressure during sleep, the method comprising: determining whether a treatment pressure at the patient interface is below a desired value;in response to said determining, increasing a pressure generated by a flow generator;in response to said increasing, making a determination that the increase in flow generator pressure has resulted in less than a desired increase in the treatment pressure at the patient interface; andin response to said determination, reducing or inhibiting a further increase of the flow generator pressure. 2. The method according to claim 1, wherein making a determination includes making a comparison of a mask leak parameter to a mask leak threshold. 3. The method according to claim 2, wherein the mask leak parameter is a mask leak impedance parameter. 4. The method according to claim 2, wherein the mask leak threshold is determined with reference to a patient arousal index. 5. The method according to claim 4, wherein the patient arousal index includes an Apnea Hypopnea Index (AHI) and/or a sleep phase index of the patient. 6. The method according to claim 5, wherein the sleep phase index includes monitoring brain waves and/or respiration. 7. The method according to claim 5, wherein the patient arousal index includes monitoring body position. 8. The method according to claim 5, wherein the patient arousal index includes monitoring snoring. 9. The method according to claim 2, wherein the mask leak threshold varies as a function of indications of a flow limitation. 10. The method according to claim 9, wherein the indications of a flow limitation include flow flattening, snore, apnea, hypopnea, and/or Apnea Hypopnea Index (AHI). 11. The method according to claim 2, further comprising programming a flow generator controller to adjust the mask leak threshold or turn off a mask leak control function. 12. The method according to claim 2, further comprising maintaining a record of incidents where the flow generator pressure is reduced in response to excessive mask leak for subsequent review by a clinician to facilitate mask selection and/or adjustment for the patient. 13. The method according to claim 2, further comprising displaying a message on the device at the end of a session where an excessive mask leak has been detected that alerts the patient to adjust the fit of the mask and/or contact a clinician. 14. The method according to claim 2, wherein the device includes one or more leak control modes. 15. The method according to claim 14, wherein one or more leak control modes are selectable depending on patient preference and/or compliance levels. 16. The method according to claim 14, wherein the one or more leak control modes includes reducing the flow generator pressure upon detection of a mask leak and maintaining the flow generator pressure at a level below a full-therapeutic pressure to allow the mask to seal against the patient's face. 17. The method according to claim 14, wherein the one or more leak control modes includes reducing the flow generator pressure to a sub-therapeutic pressure for a brief predetermined period to allow the mask to reseal against the patient's face, and then ramping back up to a full-therapeutic pressure. 18. The method according to claim 17, wherein the brief predetermined period is 15-60 seconds. 19. The method according to claim 14, wherein the one or more leak control modes includes reducing the flow generator pressure upon detection of a mask leak in excess of the mask leak threshold to a ramp start pressure used for commencement of the therapy session, and then ramping back up to full therapeutic pressure over a shortened ramp time. 20. The method according to claim 19, wherein the shortened ramp time is 50% of the ramp time used at the commencement of therapy. 21. The method according to claim 14, wherein the one or more leak control modes includes reducing the flow generator pressure by a set increment upon detection of a mask leak in excess of the mask leak threshold, measuring the mask leak parameter for a set period of time, and further incrementally reducing the flow generator pressure if the mask leak remains above the mask leak threshold. 22. The method according to claim 21, wherein the set increment is 1 CmH2O. 23. The method according to claim 2, further comprising re-increasing the flow generator pressure to re-assess a mask-to-patient seal after a predetermined period of operation below the mask leak threshold. 24. The method according to claim 1, further comprising providing a mask seal testing and mask fitting regimen wherein a mask is fitted to the patient in a clinical setting and the device is switched to a mask fitting operational mode wherein the flow generator is controlled to apply a normal range of treatment pressures. 25. The method according to claim 24, wherein a flow rate is limited to a flow rate approximately equal to or slightly above a vent flow rate for the mask. 26. The method according to claim 25, wherein a substantial mask leak is detected by insufficient pressure in the mask, and the mask fit is adjusted without undue noise and a large volume of air flow rushing past the patient's face. 27. A method of operating a device for treating sleep disordered breathing (SDB), wherein said device provides continuous positive airway pressure during sleep, the method comprising: determining whether a treatment pressure at the patient interface is below a desired value;in response to said determining, increasing a pressure generated by a flow generator;in response to said increasing, making a determination that the increase in the flow generator pressure has resulted in a greater than desired increase in an air leak from the patient interface, or has increased the air leak from the patient interface; andin response to said determination, reducing or inhibiting a further increase of the flow generator pressure. 28. The method according to claim 27, wherein making a determination includes making a comparison of a mask leak parameter to a mask leak threshold. 29. The method according to claim 28, wherein the mask leak parameter is a mask leak impedance parameter. 30. The method according to claim 28, wherein the mask leak threshold is determined with reference to a patient arousal index. 31. The method according to claim 30, wherein the patient arousal index includes an Apnea Hypopnea Index (AHI) and/or a sleep phase index of the patient. 32. The method according to claim 31, wherein the sleep phase index includes monitoring brain waves and/or respiration. 33. The method according to claim 31, wherein the patient arousal index includes monitoring body position. 34. The method according to claim 31, wherein the patient arousal index includes monitoring snoring. 35. The method according to claim 28, wherein the mask leak threshold varies as a function of indications of a flow limitation. 36. The method according to claim 35, wherein the indications of a flow limitation include flow flattening, snore, apnea, hypopnea, and/or Apnea Hypopnea Index (AHI). 37. The method according to claim 28, further comprising programming a flow generator controller to adjust the mask leak threshold or turn off a mask leak control function. 38. The method according to claim 28, further comprising maintaining a record of incidents where the flow generator pressure is reduced in response to an excessive mask leak for subsequent review by a clinician to facilitate a mask selection and/or adjustment for the patient. 39. The method according to claim 28, further comprising displaying a message on the device at the end of a session where the excessive mask leak has been detected that alerts the patient to adjust the fit of the mask and/or contact a clinician. 40. The method according to claim 28, wherein the device includes one or more leak control modes. 41. The method according to claim 40, wherein the one or more leak control modes are selectable depending on a patient preference and/or compliance levels. 42. The method according to claim 40, wherein the one or more leak control modes includes reducing the flow generator pressure upon detection of a mask leak and maintaining the flow generator pressure at a level below a full-therapeutic pressure to allow the mask to seal against the patient's face. 43. The method according to claim 40, wherein the one or more leak control modes includes reducing the flow generator pressure to a sub-therapeutic pressure for a brief predetermined period to allow the mask to reseal against the patient's face, and then ramping back up to a full-therapeutic pressure. 44. The method according to claim 43, wherein the brief predetermined period is 15-60 seconds. 45. The method according to claim 40, wherein the one or more leak control modes includes reducing the flow generator pressure upon a detection of a mask leak in excess of the mask leak threshold to a ramp start pressure used for commencement of the therapy session, and then ramping back up to a full therapeutic pressure over a shortened ramp time. 46. The method according to claim 45, wherein the shortened ramp time is 50% of the ramp time used at the commencement of therapy. 47. The method according to claim 40 wherein the one or more leak control modes includes reducing the flow generator pressure by a set increment upon detection of mask leak in excess of the mask leak threshold, measuring the mask leak parameter for a set period of time, and further incrementally reducing the flow generator pressure if the mask leak remains above the mask leak threshold. 48. The method according to claim 47, wherein the set increment is 1 CmH2O. 49. The method according to claim 28, further comprising re-increasing the flow generator pressure to re-assess a mask-to-patient seal after a predetermined period of operation below the mask leak threshold. 50. The method according to claim 27, further comprising providing a mask seal testing and mask fitting regimen wherein a mask is fitted to the patient in a clinical setting and the device is switched to a mask fitting operational mode wherein the flow generator is controlled to apply a normal range of treatment pressures. 51. The method according to claim 50, wherein a flow rate is limited to a flow rate approximately equal to or slightly above a vent flow rate for the mask. 52. The method according to claim 51, wherein a substantial mask leak is detected by insufficient pressure in the mask, and the mask fit is adjusted without undue noise and a large volume of air flow rushing past the patient's face. 53. A method of operating a device for treating sleep disordered breathing (SDB), wherein said device provides continuous positive airway pressure during sleep, the method comprising: comparing a mask leak parameter to a mask leak threshold to determine an excessive leak at the patient interface;increasing a flow generator pressure in response to said determination of the excessive leak;reducing the flow generator pressure in response to a determination that the increase in the flow generator pressure has not compensated for the excessive leak at the patient interface; andcontinuing to compare said mask leak parameter to said mask leak threshold at said reduced flow generator pressure. 54. The method according to claim 53, wherein the mask leak parameter is a mask leak impedance parameter. 55. The method according to claim 53, wherein reducing the flow generator pressure includes reducing the flow generator pressure to a ramp start pressure. 56. The method according to claim 55, further comprising ramping up the flow generator pressure to a treatment pressure over a predetermined ramp time while continuing to compare the mask leak parameter to the mask leak threshold. 57. The method according to claim 56, further comprising halting the ramping up of the flow generator pressure upon further determination of excessive leak at the patient interface. 58. The method according to claim 53, wherein reducing the flow generator pressure includes reducing the flow generator pressure by a pressure increment to a first reduced pressure. 59. The method according to claim 58, further comprising incrementally further reducing the flow generator pressure if the excessive leak is detected at the first reduced pressure. 60. A method of assessing the fit of a patient interface to a patient for a device for treating sleep disordered breathing (SDB), wherein said device provides continuous positive airway pressure during sleep, the method comprising: generating a treatment pressure at a flow generator of the device;limiting a gas flow applied to the patient to a predetermined flow rate;determining that a treatment pressure at the patient interface is below a desired value; andmaking a determination that the seal of the patient interface to the patient is inadequate. 61. The method according to claim 60, wherein the flow rate is determined with reference to a vent flow rate of the patient interface. 62. A PAP device for carrying out the method of claim 1. 63. The method according to claim 60, wherein the determination that the seal of the patient interface to the patient is inadequate is made based on the determination that the treatment pressure at the patient interface is below the desired value. 64. The method according to claim 63, further comprising: reducing the treatment pressure upon determining that the seal of the patient interface against the patient's face is inadequate, andmaintaining the treatment pressure at a level below a full-therapeutic pressure to allow the mask to reseal against the patient's face. 65. The method according to claim 64, further comprising monitoring a patient arousal indicator while the treatment pressure is at the level below the full-therapeutic pressure and increasing the treatment pressure when the patient arousal indicator is indicative of insufficient treatment pressure for the patient's airway stability. 66. The method according to claim 1, wherein the method is automatically performed by the device.