My cat is limping?

I have a two year old himalayan male
After laying down he often limps after getting up but after a minute or two he is fine. I'm not sure what the problem is since this has been happening for quite a while. I was thinking maybe since hes not very active and lays down for long periods of time his legs get tired/numb? Or is this something more serious? Please help!

He definitely needs to see a vet.  A two year old shouldn't have mobility issues, even after a long nap, and there's a distinct possibility that his inactivity is related to whatever is causing the limp.  Best wishes to you both and keep us updated!