Hi gals - i know what you are talking about. That sometimes happens to me too. I found, though, that things got more regular and easier the longer I took the Miralax. I was also taking it twice a day - one 1/2 capful in the morning and other 1/2 capful in the evening. We are all different, so this may not work for you. It does take some tinkering to find what works.
I think Dawn's right that the stool can be a bit drier; but I also think that maybe the first BM can be a bit difficult because the colon is probably still just waking up (my colon is like me - it takes me forever to wake up in the morning!). I find either a hot or cold drink helps stimulate the system, and walking around, stretching and so on, gets things moving so that the first movement comes a bit easier.
BTW, Sue, there is no such thing as TMI here!
I've written detailed descriptions of every different kind of stool - I'm developing a new genre of literature: poo poetry.