There's nothing you can do about it, except for joining the club of frustrated users here at Meizume (myself included) who've been asking Meizu to change this since the dawn of time.
ahh... this is one of the first features that i wanted fixed since i got my m6. but alas, it's still nowhere in sight. let's hope meizu will implement in future firmware. actually, that's the only thing we CAN do. hope. and pray. :D
no , the sleeptimer is to automatically shutodnw the player is a button jhasnt been pressed for a certain time , say if you fall asleep while listning to the radio , whereas the automatic timer is if the player is on pause it shutsdown after 3 mins , but if its not on pause it wont shutodnw