I used to do Lantus at midnight (bedtime) and again when I woke up, usually 7am ish. The overlap took care of my Dawn Phenomenon reasonably well. Prior to that I was waking up with high BG.
Now I am on a pump and basal control is a lot easier to get right. I was lucky though, 2 x daily Lantus worked well for me so I guess (apart from at dawn) my basal requirements are a nice, flat, straight line through the day and night.