Ha! rpopz I know the feeling!
I think infacol is drops and so easier with BF than colief. I shall investigate.
We have a night and morning "routine". Around 7 we top and tail him (can't bathe at the moment as he has an infected finger), I rub in some moisturiser and feed him in half light. From then on he is kept in the dark. Clearly, he doesn't sleep from this time (he has done, twice) but we just keep settling him and putting him back into his crib. Eventually he might sleep from 10/11pm.
At 7am (ish) I open the blinds and day starts. Again, I top and tail him and change him for the day. I then feed him and play with him for a bit before trying to get him down for a nap.
During the day I try to make sure he doesn't sleep immediately after a feed (this is not always successful as he loves falling asleep on the boob) and so I chat to him, put him in a bouncy chair etc.
naps during the day are in daylight and I don't try to keep quiet around him.
At night I put him down after feeding and winding.
I hope these things will show the difference between night and day - so far, 2 weeks in, they seem to be working a bit. I am well aware this could quickly change.
It is so tempting to bring him downstairs in the evening when he is screaming but I am trying to persevere with keeping him in the dark 7pm -7am.