Orange ~ I understand your concern. My ds won't go down in his bassinett for long.
Our evenings are always as follows : he lays in my mother's arms at around 6pm while I go to bed for a couple of hours.
I then get up to feed him, then go back to bed for another couple of hours or so. At 1am, my mother and dh go to bed and ds and I go through the same routine - I change him and feed him and put him in the bassinett at the side of our bed, where he frets for a while and I keep stroking his forehead or adding slight pressure to his legs. He EVENTUALLY settles for maybe 1.5 hours, then we get up for a feed and I then put him in his car seat, laying on a soft blanket, where he settles for a while. Then we feed again and change, then I put him in his 'infant to toddler rocker' with the vibration going and I lay on the couch at the side of him.
It's tough as it takes him a while to settle, he's very hiper and wide awake in the early hours, sleeping during the day! Typical.
The SIDS thing is certainly a worry and we have to be very careful. I really don't know what to advise you but I hope you can use one of my methods with success.
Good luck.