One way to determine whether your work is fulfilling is to observe how you spend your downtime. Consider your energy level in response to the activities you partake in. Consider “A” a bucket of activities that give you energy and joy. Consider “B” neutral. Consider “C” the opposite of A; it drains you of energy, and just thinking about it puts you in misery. You can determine your fulfillment level by observing your relationship with “B” activities during your downtime. Whether going into the state of not being drained feels like relief or a waste of time depends on the your work’s fulfillment level.
If you can’t wait to grab a beer and zone out in front of the tv after work, then your work is probably not very fulfilling. It likely drains you of energy; you get tired even thinking about doing them. Since your work drains you, just going into the state of not being drained feels like a relief, and you opt into passive activities during your downtime. But if you get home and zoning out in front of the tv feels like a waste of time, then your work is probably filled with activities that give you energy. Just going into the state of not being drained feels like a big waste of time. Understanding how you spend your downtime helps you learn about yourself and what your true passions are.