We'd give our patients some peanut butter crackers and a glass of milk. The problem with a high sugar snack like fruit or (bad boy) a candy bar is that it will spike your sugar quickly and then drop it as quickly. The complex carbos cause a slower rise and the protein will keep it there.
If this is a common thing in the middle of the night, you need to call your doctor ASAP. You're not going that low yet, but every time you drop your sugar you lose a few brain cells. Dunno about you, but I'm past the point of being able to spare any. It may be a case of lowering your PM dose or eliminating it completely, or scheduling a bigger bedtime snack.
One of the things that happens when we sleep is an increased sensitivity to insulin, which is why that 3 AM wakeup with shakes and sweats happens a lot while people are getting their insulin dose regulated. After 3 AM, your liver starts to release some glycogen, so if you sleep through the low, you will probably have normal or slightly elevated sugar at breakfast.
A good discussion can be found at
http://www.diabetesnet.com/diabetes_control_tips/hypoglycemia_prevention.phpLet your doc know you're still waking up with hypoglycemia on the 70/30. It sounds like he needs to reduce the dosage or change the timing.