It's called biphasic sleep, and many believe it to be a lot healthier than monophasic ('normal') sleep anyway 
And you'll also find it's efficient on time than monophasic sleep, so it's not surprising to me that you could only nap for 1.5 hours, considering that you sleep for 5 hours at night anyway.
If you just keep doing what feels good, and you don't feel horrible in the waking hours, then it's all good ... congrats on becoming polyphasic 
Put it this way.. many people who start out doing uberman end up eventually settling into biphasic.
And lately I'm finding myself going that way too. It's just a lot more convenient.
At the moment, I'm doing something like this:
4am-7am
1pm-2pm
10:00pm-10:20pm
12:00pm-12:20pm
I suspect I'll end up in something even simpler eventually
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