Not the Death Star, this is from empire, this would be the inside of cloud city

Here’s the thing:

Fatigue is normal, but will get worse over time if you don’t address it.

First, recognize that you might be putting too much on yourself. If you studied / programmed 10 minutes a day, every day, you would achieve more than someone who studied 2 hard hours every weekend. So consider whether you’d be fine doing a half an hour or less on some days if you don’t have the energy.

Also as others have pointed out, memorizing everything isn’t that useful, practicing is. Build something fun!