Hello
@dogslife, your gliclazide medication is the likely culprit for your hypo according to the below thread, and the catalyst could possibly have been the temperature:
http://www.diabetes.co.uk/forum/threads/cant-be-a-hypo.27654/
We all react differently when it comes to the effect of temperature variances on our BG. Some go high, some go low - it's just an individual thing.
Did you have a drink last night? The reason I ask is that hypos following a drink (even a moderate amount) can result in lower than normal BG/hypoglycemia - even well into the following day.