That's a heck of a dose to be taking of both medications.

they both can make you sleepy, so taking them both at once might be a bit much. Might be a good idea to ask the pharmacist exactly how you should be taking them and if you should Split up the time between when you're taking both medications.

I know when I took Neurontin it knocked me out for the day with the lowest dose.

Hope you weren't driving When you were taking that