Class all day. Prepare a dinner that doesn't reek of "I'm single and don't merit anything beyond microwave frozen diet meals." Spend time on freelance projects. Do the laundry so that clean sheets and scrubs are available tomorrow. Check in on the sick and afflicted in my family. Bed time.
I'm sure that for a few months I can do this. But "sure" is definitely not a definitive response to "definitely tired."