Charlie, no that is not how I am doing things. I am imaging from about 200 am local and imaging through to 6 am. My first images were when the seeing was very unstable. I am doing all nighters though as sleeping and then getting up and even having gear prepared is not well organised. You cna make mistakes with collimation because your eyes are not awake and I find it better for myself to run like this. It means the following day is killed but I just turn the phone off and crash.
In terms of seeing, it ranges really, good seeing seems at present to start about 230 ish and goes for a few hours. As winter progresses here is becomes earlier an earlier.