Hari Om!
Sw. Sivananda has written in many of his books on the subject. He suggests getting up one half hour earlier than your normal wake time for a period, then another 1/2 hour, etc until you are up at the desired time. I admire your efforts here and know from personal experience that you will benefit greatly.
From my own practice, after washing hands, feet, etc, I do some pranayam and light yoga. Helps me wake and ready myself for meditation.
In terms of SOHAM, I simply use time as a guide. www.swamij.com may give you additional ideas and information.
Jai Jai Hanuman!
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