I have actually had the opportunity to drink Degh with Nihangs. I felt relaxed, calm, and kinda focused. It kills that anxiety knot-like feeling you get in your stomach. Because of this, I always thought of it as a way to calm your nerves before battle. Imagine preparing yourself to launch an attack against some Mughal, Afghan, or some other adversary. The anticipation, unless you're at a high level of bhakti, will get to anyone. Your heart would probably be beating out of your chest, some may even shake and feel jumpy. Drinking Degh essentially eliminates that feeling completely and allows you to focus in on the task at hand.