For dawn phenomenon, the way to prevent morning highs requires you to prevent middle-of-the-night lows. If you're using insulin, using a little less of the long-acting type of insulin usually works. If you're not using insulin, you'll have to eat SMALL bedtime snack containing a small amount or carbs - try various amounts until you find the right amount.

The liver stores sugar as glucagon then when level goes down in the night the liver fires off glucagon so that's why it is high in morning. As for weight I it on weight after starting lantus. I looked up side effects but weight gain not mentioned

I don't get it either! I'm at a healthy weight, walk four times a day and don't eat desserts or snack at night and for the past few months my blood sugar levels in the morning are outta control!!! 8.2 this morning!!! BTW I take Metformin twice a day.

I have type 2 and on tablets. My levels are higher in a morning but lower if I have a snack before bed. I usually have some prawn crackers. Plus I have lost a lot of weight. I had a small Apple the other night and my sugars were really high the next morning. Back to the crackers!!! I don't let it worry me anymore I just do the best I can and seems to be working.

I have always been told that Lantus does not cause Weight gain. Other insulins do, such as Humalog or Apidra or Humulin , or even the insulin mixes such as 70/30. The difference is because Lantus is a BASAL insulin and secretes a small amount of insulin over a 24 hour period. Lantus is also called or termed a background insulin. When we take the other insulins, this causes the glucose to move from the blood stream and into the tissues, hence, weight gain. My Diabetes Educator who trained me in Diabetes education and management, likened the process as to insulin being the key that opens the door for the glucose to move from the bloodstream and into the tissues. That's why we can gain too much Wright if we eat an excess amount of refined carbohydrates and sugars.
Lantus acts differently as it is only considered a background or BASAL insulin, which we all need for proper functioning of our various body systems. I kind of liken this to how a gas stove operates - tge pilot light is always on but when we need to cook we turn on the individual burners in order to cook. Same as LANTUS taken at nights, with Apidra, Humalog before meals or even 70/30 insulins normally taken twice per day. 70/30 is a combination of regular insulin with an intermediate insulin.
Hope this helps in understanding why Lantus is not usually associated with Weight gain.