Exactly what @chad and others have said.
When my alarm goes off at 0445, I think, why am I doing this? To be better, stronger, faster of course! After years in the Army, early wake ups are easy for me. However my tips are, when your alarm goes off, get out of bed and stand up right away. RIGHT AWAY!
I have everything preped. Even strong instant coffee in the mug with a spash of cold water. When the kettle is boiled, I make my brew and can drink it fast. After I feed the pride of cats I head straight to the garage and the cold is usually enough to wake me up fully!
All this makes a ‘lie-in’ until 0545 seem like a treat!