With all due respect to your boyfriend, that’s just silly. Listening to your body is the first part of getting out of your head, paying attention to the moment, and is a great way to open up creative and intuitive thought.
Yes, I know that sounds ooey-gooey, but part of my struggle in my mid-twenties was transitioning from the ultra-critical computer science university education to an approach that would allow me to be…creative. Artistic. Critical thought, while useful, isn’t the most conducive to success in an MFA.
I, too, treated my body like it was a separate entity. Like a lot of hackers, I viewed it as a machine that I could will into my bidding. Ultimately, you’re denying yourself a lot of resources—because ultimately what you’re doing is denying some impulse—be it for sleep, or hunger—and that’s a dangerous road for someone in a creative field.
So. What can you do? I’m just going to throw out a few things that helped me (unfortunately you’ll have to figure out what works for you). For me, what worked the best were approaches I picked up from Alexander Technique. Noting, (hopefully without judgement), when I noticed that my body was telling me something, and (even more importantly), noting when I noticed that I was ignoring something my body was telling me. Don’t focus so much on changing, but merely noting.
Other good (fairly obvious) things to help you get more in tune with your body—exercise.
Also, slow down. If just for a week. Just slow down for a week. Try noticing more how things taste. Give yourself permission (for a week) to lie down if you notice you’re tired. Notice your breathing.
You also may want to read Zen in the Art of Archery.
Above all, know that this is a good and worthy thing to focus on.