DS2 is 4 months old and formula fed. Has been a reasonable sleeper but has started waking at 1am and 4am ( actually it has started since the clocks went back). if I put his dummy back in he goes back to sleep (at 1am until 4am and at 4am until 5.30am when I do first morning feed). I am certain he is waking looking for dummy. Anyone any experience of this and how to wean him off it ? I use the dummy to get him to sleep at 7pm.