I'm working at the gym pretty intensively, not every day but when I workout it is to complete muscle failure. I'm feeling pretty tired, today after gym I crashed for a 3 hours nap after a 7 hours night sleep.

Should I have some carbs? I hardly had any in weeks. And if so, which ones? If I think about rice or potatoes I just don't "feel like it".... I have no carbs craving. Maybe it's something else and not nutrition related?