I think that DS (2 months old today) needs to go to bed at a proper baby bedtime instead of an adult bedtime. I think most people put their babies of this age to sleep in a moses basket in the room with them and then take them up when they go to bed - but my DS refuses POINT BLANK to go to sleep in a moses basket. The only time & place he'll sleep in his cot is upstairs, at nighttime, in the dark. So unless we go to bed with him at 7 or 8pm (which I don't really want to do), it means him being upstairs in the room by himself.
But, the FSIDS advice says not to do that - so what would you do if it were you? I'd be happy to keep him up with us if he was happy, but he's cranky and fussy and really needs to be asleep. Sigh, what to do, what to do....