Congratulations!!! Welcome to the club!
If your Diabetes Educator didn’t lower your basal by around 10-25% for starting the pump, then you’ll find this happening. Also if your basal/bolus wasn’t quite right on MDI. Or if you didn’t have good control in the weeks before. It’s then much harder for them to work out what your pump starting rates should be. Absorption is also better on a pump.
My DE got it almost spot on for me and I’m still working with her to make tiny adjustments here and there.
I’ve been on a pump for 8 weeks now (Animas) and I’m loving it to bits. I now have different basal rates for different times of the day… my lows are around 6-8pm and my highs are around midnight-2pm, so my basals reflect that.
Also, don’t forget, any adjustments you make now will have an maximum effect over the next 1-2 hours.
If you’re not eating and not giving boluses, then you may be right that the basal is too high for you at this time of day. At least with a pump, you can make tiny adjustments. Do you need to call anyone before making adjustments? I don’t know how it works in the USA. But clearly if you’ve been given permission, you should pull your basal down slowly until you’re within your target range 2 hours later.
What confuses things is if you’re eating as well. It could be your I:C ratio is off, or even your ISF. Only you would know which of these are possibilities.
First couple of nights, try to wake in the middle and test to make sure you’re not going low. It’s a bit nerve wracking the first couple of weeks. You fingers will feel like pin cushions from all the testing!! But it’s so worth it!