Wake Up Early

My Target is wake up at 6:45am on weekday by the end of May.

I read some tips from LifeHack, "Have a plan" is good idea to me. whenever i sleep, i will think about what i wanna to do on next day morning time... such as read magazine or finish sth...

Also i will do some exercise to warm up myself which will help me feel full of energy at beginning.

Now i think i need to set a "button" which will trigger me to wake up.