No co-sleeping let them sleep in their own crib preferably in their own room away from you.
All I mentioned above but even more of it. This age babies learn what to do to get whatever reaction they want from their caregivers. They have figured it out. This is also the stage where separation anxiety kicks into high gear. Google 'separation anxiety' and use those tips. It is a hard phase, but if consistent you both will survive with your sanity and eardrums in tact :)
All the above plus hopefully if you are now headed back to work you have been taking them on play dates. Working on socialization, not home all day alone with them or the grandparents.
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