Philosophical Musing

I've been thinking for a few weeks now about what, technically, is happening in bed in the morning before I get up.

As I understand it we 'wake' several times a night to varying degrees going in and out of sleep cycles and such.  

So when I am in the "early morning" type range, say 5am or so and I notice it's maybe kind of light out and I know it's not yet time to get up and I go back to sleep, am I napping?

Like am I napping when I "sleep in" in the morning or am I still sleeping because I've now lain in bed a few times wondering about that.

I mean a few mornings ago I got up at 7am and went pee and then went back to bed and that seems like a nap but also seems like I went back to sleep.

Is a nap defined by its length?  It's timing?  Location?  Time of day?  

I'm sure there are no defined answers to this but until my brain decides to stop wondering about it, it's on my mind.  Am I napping in bed most mornings or am I continuing to sleep?