Baby wasn't breathing while sleeping til I turned him on his side now I'm afraid to sleep

My son thought he is 4 months tends to roll himself on his front while sleeping and while this is normally OK during the day while I'm awake I tend to try and roll him over to his back or side while my husband and I are both in bed. Last night since my son seems to sleep better when he's on his front I decided to take a chance (not doing that again) when I woke up earlier to a strange noise that Im fairly sure came from the animals and not him I turned over to check on him and he wasn't breathing I shook him and he took a few breaths but then stopped again so I turned him onto his side and now he seems to be breathing fine but I'm terrified to fall back asleep. This happened at 245 and I went to bed at 10. I have to wake up for work today at 5 I feel like I've functioned on less sleep I bet I can make it.