I meant on the far side but yes it still leaves gaps. prob best to have a safe space for him like cot side up for when you are not there and then have him in bed with you after. easier said than done I know. my 15month old won't settle in bed unless I'm there so sleeps in the living room on a beanbag until I go to bed!
I'm going to be getting a bed guard. Dd sleeps in her cot until about 12/1 when she wakes then comes in with me I usually pull the cot up to the side of the bed so she can't roll out but one night I woke up to a thump and she was on the floor
I must have got her out the cot still asleep as I hadn't done any of the precautions I always take (pull cot up, remove pillows, tuck duvet under matters so I can't pull it over her) She was fine but I felt awful. Still feel sick when I think about it!
Have you got one of those breast feeding/pregnancy long or curved pillows?
I used to put one of those on the "boundary" between the cot and my bed and that normally kept mine in their cot. They can eventually shuffle over them but they do soon seem to get a sense of the edge of the bed as well.
I have also put pillows on the floor in case they fall off for piece of mind before I go to bed.
a bed rail or if your cot is on wheels and you can move it easily you put the drop side up nd take it down when you go to bed. but a bed rail on the other side of your bed easiest! you can pick them up for a fiver or so second hand.