Bageshwar Dham Sarkar
Why do I feel lazy and sleepy when I sit for puja, and what should I do?
Laziness in puja: two causes and a remedy
Laziness during puja has two causes: negative energy, or the sin of the body. For the sin of the body, the puja must keep going and its time should be increased.
The second cause is the sin of the body, so this should keep going, and increase your puja time more; a day will come when even the yawning will stop.