Yogi: I use the breath as the primary object, but the mind still wanders to thinking, falls asleep and then returns to the breath, back and forth. Which primary object is good for me?
Sayadaw: Whichever object is not very important. What is important is the way to be aware – if you’re aware with interest, the mind wakes up, and it won’t be sleepy.
You need to learn how to be aware with interest. Interest means you want to know what is going on in the mind.