when dennis and robby sleep, they definitely unconsciously search for the others pulse. they cant sleep deeply without having found it.
it happens no matter what position they sleep in. dennis is lying with his head on robby's chest? he nestles right over his heart and one of robby's hands rests on his neck, the other on his back. they're spooning? robby curls an arm round dennis to place it on his chest while dennis holds the wrist of that arm. they're sleeping face to face, legs tangled together? either their chests are touching or they're holding hands. they're never separated and they never drift apart in the night.
without the constant thrum and pulse of the other's heart, neither will sleep a wink. no relaxation until they can feel the safe-safe-safe-safe-safe-alive-alive-alive-alive beat of the other pressed to their body. it's just what they need and how they love.
