Before letting your mind wander, be aware of your surroundingsIt is quite natural to be lost in thoughts. But we should make sure that we are conscious or has full knowledge of our surroundings. Our mind will not bother these, it will just take us into deep thoughts. Finally, we will be stuck with the thoughts and we will end up doing some mistake.
I was recently taking a bus to home from work and I do not know when I fell into thoughts. I would have missed my stop and would have to walk back again but luckily somehow the driver put a sudden break and that made me come back to reality. Thankfully I could get down at my stop itself. Thereon I am very careful these days. There is no point of physically being present and mentally being somewhere else. Hence before letting your mind wander, be aware of your surroundings.