Sounds like he's just dreaming. They'll do everything from moan and snort to bark, yelp, howl and scream as they run. It can be very cute and it can also be annoying! 7 weeks old is very young. How long have you had him? Most go home around 8 weeks and they definitely dream, have nightmares and make all sorts of noises for the first few days to weeks depending on the dog.
When in doubt, always check with a vet. Not necessarily for this, but since this is your first, just keep that in mind down the road if you're worried about something that seems off. We can always give advice, we can always say what we think. But we can't examine the dog and we can't do anything. So if you ever see something crop up that you're truly worried about, of course post and ask, but never be afraid to go to a vet. Worst case you're out an exam fee, best case you catch a problem early on.
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Whelp Date: Feb 11, 2018
Correct bad behavior, don't redirect. Redirecting is rewarding, not resolving.