Baby wont nap unless on my bed! 😭

So my baby has never been a good napper..he really started doing great with sleeping at night anywhere between 930pm til 8am with 1 dream feed to tie him off. However day time naps! Nooope! So recently I started laying with him on my bed in a darker chill environment to calm him and he immediately falls asleep and sleeps like upwards of 2 hours! But! He won't sleep in his bassinet unless at night! Help! I don't want him to get used to being on my bed bc I know its not safe.. i do have a video monitor and watch him like a hawk..ps its a huge bed..hes always in the middle with barriers..and hes not roling yet