This is what I do too. At the very least I'll open a few files, launch some terminals and cd into the requisite directories, start the development server, etc.

This is what I do too. At the very least I'll open a few files, launch some terminals and cd into the requisite directories, start the development server, etc. I also highly recommend trying the same with exercise. On days when I am sleep-deprived or too sore to do something more strenuous like lifting or sprinting, I take an hour long walk and then almost always feel rejuvenated by the next day. It really helps because you'll still feel like you haven't broken your routine.