For the first 5 months of my BJJ training I always went at night and only two times a week. I worked hard, my cardio improved, and I saw small improvements in my performance. But I would still be draggin at the 4th roll. I figured this was normal. A slow progression "fitness wise" A few weeks ago I started going 3-4 times a week. Usually hitting a noon class once or twice a week as well. I began to notice how crappy I felt at my night classes compared to the day classes. My day classes my cardio was better and I had an all around good class. As opposed to the night class, where by the 4th roll I was really gassing and my concentration would falter. Now I know, I am gonna be more tired etc. etc. And I am 35 years old and age can start to play a roll etc etc... I am getting 8-10 hours of sleep and getting at least 3000 calaories of healthy, nutritious food (peanut butter, whole wheats, protein, water, vegetables, etc. etc). Is there something I could drink an hour or so before class or eat something different for lunch or dinner to give me that extra burst so I can feel like I do during the day? All natural and healthy of course.... Anyone else notice this happen to them? If so, what do you do? Oh and my night classes are at 8:15 PM.