Ask HN: I found that I often have a lazy day after productive day

I study at college. Getting my degree in Data Analytics. I study programming almost every day and as many students I also work part time. But in the last 6 months I found that I often live in a cycle where I have a productive day and the next day is lazy. So, I find it super unattractive to do anything. Then it repeats again and again. Have you ever experienced something like this? What would you recommend me to do to get out of this cycle? P.S. I push myself to do stuff on the bad days to gain that ‘work flow’. But it doesn’t feel like it helps me. Because of low energy levels on lazy days I do things slowly, I can’t concentrate on things and so on.