The other answer is valid, some cats just having you nearby.
There is another reason: forgetting there was already food. I've seen my youngest cat do this often.
He's so eager for a treat that whenever I even vaguely move in the direction of the kitchen, he will try to guide me to the cat treat cupboard.
When he enters the kitchen, he passes the bowls. If there is still food in there, he turns towards the food instead and no longer tries to guide me, nor does he prevent me from leaving. I suspect he simply forgot that there was still food, or assumed it was eaten (we have 3 cats so the others may have eaten it).
Since you say it happens right after a nap, it might simply be that your cat has forgotten about any leftovers, and has gotten in the habit of asking for food before checking is there if any available.
The solution to that? Teach the cat to look for food before asking. I can think of two ways to do so. It depends on your cat:
- Ignore the request for food. When it's adequately hungry, the cat will go looking for food anyway.
- Put the food next to where the cat naps. Gradually move the bowl back to its starting position. Move the bowl a few inches/feet every few days, so that it's always in sight when your cat visits the previous position of the bowl.