Some ways are as follows:
- Experience the sensation of breath above the upper lip every few minutes.
- Take deep breath occasionally.
- Increase the flow of blood in the brain by bending the head towards the floor after taking Sukhasana posture once/twice a day.
- Be aware of your presence, body sensations and activities of the surroundings once in a while.
- Periodically ask yourself, "Who am I?" or mentally say "IAm" a few times.