I know this has probably been dealt with before, but I just don't have time to read through previous posts.
My 2.5 year old son has been on EASY since birth and is an ANGEL (thanks so much Tracy!!) He transitioned to a big bed without issues at 20 months and has generally been an amazing sleeper. Even when we brought home my daughter 9 months ago, he has always slept through the night without issue.
We've had to drop his day time sleep, because it would take us till 10pm most nights to get him to go to sleep, without it, he goes down easily within 2-3 minutes at 7:30-8pm. The problem has been, in the last 6 months, he consistently walks into our bedroom usually 2-3 times a night around 1pm, 3pm and about 5pm at which time, we struggle to get him to go back to sleep. At 1 and 3 we generally just have to turn him around and sit beside his bed for a few minutes and he's back to sleep, but at 5 - he can be up for good. It's driving us crazy with the interrupted sleep.
We tried everything, mum putting him back to bed, dad, shutting his door (which he just melted down bumping into walls/walking in and out of his closet - I couldn't bear to keep that up so we tried a gate instead with the door open, to which after almost 8 days of consistent screaming for up to 1 hour at the gate to "let him out" was just not working for us (not to mention - all he has to say is "need to wee" and we HAVE to let him out to go to the toilet or he wets himself).
His routine is generally - up between 5 and 6, a normal day but no sleep - loads of activity, with dinner generally finishing at 6pm, bath, storytime then bed by 7:30-8pm. He sleeps very well from this time, but then wakes around 1ish and it all begins!
I personally feel that he's not getting enough sleep in total, which may be causing our problems, but just cannot return his day sleep as it honestly deprives us of 2 hours in the evening (walkin-walkout or just sitting there with him to keep him in bed). Any ideas/suggestions?