Naam Abhiyaas and Sleepiness

WaheguruJiKaKhalsaWaheguruJiKiFateh Jeeo.
What is the cure for sleepiness/dozing off during naam abhiyaas during Amrit Vela? I've been doing abhiyaas for a long time and I've tried standing up, sitting up straight, but that seems to work only temporarily. Is this simply loss of interest at some point or something else, like loss of consciousness? In contrast, I am usually completely awake while I do Nitnem.
Any suggestions are appreciated.
Bhul chuk muaaf,
WaheguruJiKaKhalsaWaheguruJiKiFateh.

Please try to sit at an airy, well ventilated place. Closed rooms often have lack of oxygen, resulting in drowsiness.

WaheguruJiKaKhalsaWaheguruJiKiFateh

Bhai Veer Singh Says that initially for a new abhiyaasi it will take time to adjust and so a sleep of at least 7 Hours is a must. So if you plan to wake up at 2 then sleep according that you get the required sleep. There are Gurmukhs who sleep less but then that's the level ahead.Just sharing what I heard. Please add . Bhul Chuk di Kheema. Sat Kartaar!!