MIT-BIH Polysomnographic Database

The MIT-BIH Polysomnographic Database is a collection of recordings of multiple physiologic signals during sleep. Subjects were monitored in Boston's Beth Israel Hospital Sleep Laboratory for evaluation of chronic obstructive sleep apnea syndrome, and to test the effects of constant positive airway pressure (CPAP), a standard therapeutic intervention that usually prevents or substantially reduces airway obstruction in these subjects. The database contains over 80 hours' worth of four-, six-, and seven-channel polysomnographic recordings, each with an ECG signal annotated beat-by-beat, and EEG and respiration signals annotated with respect to sleep stages and apnea. For further information, see Signals and Annotations.

The database consists of 18 records, each of which includes 4 files:

Sleep/apnea annotations	Beat annotations	Signals	Header	View waveforms
slp01a.st	slp01a.ecg	slp01a.dat	slp01a.hea
slp01b.st	slp01b.ecg	slp01b.dat	slp01b.hea
slp02a.st	slp02a.ecg	slp02a.dat	slp02a.hea
slp02b.st	slp02b.ecg	slp02b.dat	slp02b.hea
slp03.st	slp03.ecg	slp03.dat	slp03.hea
slp04.st	slp04.ecg	slp04.dat	slp04.hea
slp14.st	slp14.ecg	slp14.dat	slp14.hea
slp16.st	slp16.ecg	slp16.dat	slp16.hea
slp32.st	slp32.ecg	slp32.dat	slp32.hea
slp37.st	slp37.ecg	slp37.dat	slp37.hea
slp41.st	slp41.ecg	slp41.dat	slp41.hea
slp45.st	slp45.ecg	slp45.dat	slp45.hea
slp48.st	slp48.ecg	slp48.dat	slp48.hea
slp59.st	slp59.ecg	slp59.dat	slp59.hea
slp60.st	slp60.ecg	slp60.dat	slp60.hea
slp61.st	slp61.ecg	slp61.dat	slp61.hea
slp66.st	slp66.ecg	slp66.dat	slp66.hea
slp67x.st	slp67x.ecg	slp67x.dat	slp67x.hea

Andrew Walsh observed that the calibration originally provided for the BP signal of record slp37 is incorrect (since it yielded negative BPs). slp37.hea now contains an estimated BP calibration that yields more plausible BPs; these should not be regarded as accurate, however, since there is no independent calibration standard available for this recording.