Sleep Master is an app which helps relieve pressure and leads directly and indirectly into a deep sleep.
Features:
1.three modes(sleep,relax,memory), you can change mode which you want
2.40 sound effects and 22 light music,all the sounds uses a binaural beat technology, which has been scientifically proven effective
3.use "Flicker Noise" as background environmental sound，which is known to help balance the autonomic nervous system and helps relieve pressure on the sympathetic nervous system.
4.support settings the playback time,and can background play