Blitz,

One last thought...something that has helped me out, YMMV...

Before I go to sleep,I conciously calm my mind and mentally direct my sub concious to focus on preparing me for the event / task at hand tomorrow.

Simple direct positive statements, such as "Subconcious, prepare us to do well and succeed with [insert tasks / event etc. here].

It may sound strange, but it is just like using visualizations during concious preparation sessions, and has the advantage of allowing me to sleep well because my concious mind knows that my sub concious will handle the heavy lifting before hand.

Best wishes,
Comanche7