We had my son sleeping in the bassinet next to the bed which was very convenient NOW my son won't go…

We had my son sleeping in the bassinet next to the bed which was very convenient NOW my son won't go to sleep unless he's in my chest . Every time I put him down he's starts crying uncontrollably but stops right when I pick him up. And it's only at night .. Idk how to get him back to sleep somewhere else besides my chest ugh!