Morning readings

Hello everyone. I've been using my meter and testing before and after meals all week and seeing what foods are ok for me. Got my readings down to in the 5's before meals and 8 or under 2 hours after meals. Last night I had steak, mushrooms and salad with a fruit jelly and very small spoon of diabetic ice cream my husband bought me so I don't feel as if I'm going without when everyone else has a pud. My reading before this meal was 5.8 and 2 hours after 7.3. My reading on waking this morning was 6.2. My readings in the mornings have been in the 6,s since I've started testing. I don't understand how before my meals with a gap of 3-4 hours between meals my readings are in the 5's but on waking with a gap of 10-12 hours my readings are in the 6's. I asked my DN this the other day and she said it's due to whatever I've eaten the day before. I've read on here about the dawn phenomenon, is this why.?

Thanks daibell I thought so too. I've been testing on waking pre lunch and 2 hours after and again pre dinner, post dinner and bed. I've managed to lower them all and pre food is now mostly in the 5's and post is in the 7's . I've lost almost a stone so quite pleased with myself it was just the waking reading that I didn't understand.