5) Staged crying responses. If the fuss starts immediately after you leave the room -- or even before you leave the room. Give it 30 seconds, then return, comfort and love, explain the routine in simple terms, leave. If the fuss continues, wait 60 seconds, return, comfort and love, leave. If the fuss continues, wait 2 minutes, etc.
this is good. also in doing this, gradually reduce the amount of verbal communication each time. eg. first time you return talk and explain blah blah blah time for bed, etc. next time it's just 'blah' and eventually it's just silence and only motions to put them to bed.