The sleep stages displayed on the "HOME" section of your Dreem app is based on three sources of information:
- The EEG (or electroencephalogram) which detects your brain activity
- The accelerometer which measures your movements and breathing
- The heart rate monitor (or pulse oxymeter)
This full set of informations results in the calculation of your hypnogram every 30 seconds, available after your sleep session on "HOME" section.
Please note that the time to fall asleep corresponds to the period of time between the first wink of your eyes and the consolidated sleep.