Waking baby up for every nap? Also, night terrors.

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My son (13 months) has always been a great napper. Lately he has had a hard time going to sleep at night so we have been limiting his 2 daily naps to 1.5 hours each. Which means we have to wake him up a lot of the time. I feel like that's just not healthy, but neither is sleeping poorly at night. On a semi related note, yestersay he only got a total of 1.5 hours of napping becuase we were on the go for my SILs graduation. He woke up around 8:45 with a weird screaming and we could not calm him down for at least 15 minutes. Once he woke up all the way he was a little shaky and disoriented, but finally was himself around 9:45. I was very worried thinking the screaming was a seizure, but with everything together, I think it was a night terror. Any advice on these two sleep problems is greatly appreciated!