The third in our series of tiny changes:
Get 8 hours of sleep a night.
There are tons of reasons for getting enough shuteye, which I've included in links to several sources here, including improvement in memory. Having a sharp memory is kind of important when you're learning voice lesson repertoire, an opera role, or the material for that biology exam. It also reduces the likelihood of various diseases.
More on this later this week. But for now, just try to get your eight hours of sleep, every night!