Side sleeper

I’m on winter holidays with my mum and sister in law and my 6 month old little boy (missing hubby like crazy!) my little one has caught a cold from us but is doing well, very happy still.

Seeing as I have beds to myself and they’re double beds I’ve had bub in bed with me at night to monitor his breathing and temp as he is stuffed up and he’s a little clingy cuz he isn’t well. (I’m normally dead against co sleeping- all precautions are taken to make sure I’m doing this safely and I’m a light sleeper that doesn’t move around)

But he has started falling asleep on his side... and wanting to stay on his side. his breathing is normal and hes very comfy... but I just don’t know how safe it is to let him do that? Once he’s asleep I gently roll him on his back ... this is my first baby and I’m trying not to be an anxious mother but also don’t want to do anything wrong lol...

Anyone else with side sleepers or advice?

Ps: he’ll be going back to his own cot and room back home 💙