There are a few reasons you might feel tired after getting a tattoo. For one, getting a tattoo can be quite taxing on your body. Getting poked by needles repeatedly can take its toll, especially if you're not used to it.  Additionally, the ink used for tattoos can also be quite tiring for your body to process. And finally, it's not uncommon to feel a little bit of pain after getting a tattoo, which can also lead to fatigue. If you're feeling particularly tired after getting a tattoo, it's best to rest up and let your body recover. Drinking plenty of fluids and getting some sleep should do the trick.