Mantras

I have found that it's more useful to have a mantra that has meaning for more analytical meditation with visualizations.

Such as for meditating on compassion

bka-mi or prami is love
bq-Ndq or pahntah is friend
ga-Nkq or kanrah is health

for ordinary mantra i use

mq-Ndq or mahntah is mantra

I found that meditating with zi-bNa sipna at to fall asleep had me repeating it in my morning meditation, I found it to be more effective as it had the associated meaning and channeling of energies into sending me into a relaxed sleepful state.