Yep. Totally normal. Probably won't stop for a long time either, lol.
I always thought the zoomies were due to me not doing enough to tire out the dog but the trainer told me it was over-tired-ness (like you mentioned). So I started observing and almost every time my puppy starts doing laps like that it's near the end of the day and a long nap follows. With this dog it seems to be a sign off a job well done on my part.Once you know puppy has had stuff to do and -still- doesn't chill out.. they might be overtired.