tattoo lovers - I need advice

This is not my first time getting tattooed. Last night I went in to get more work done on my sleeve. I went home afterwards and slept from like 10:30 or 11 pm to about 8:30 am..about 10 hours and that's A LOT more than I usually sleep at night. I was only awake today from 8:30 am to 11 am and then fell back asleep. I just woke back up at 6:30 pm...so another 7 1/2 hours of sleep. Is this normal?! I've never slept so much the night of/day after getting a tattoo but I don't know if it has anything to even do with it. Anyone else experienced this afterwards? Should I be concerned or is it just my body healing from the ink?