My son can now roll over . . .But. . .

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He sleeps in a cradle at the moment and when he rolls over there is no more room for him to get back over (he only rolls on one side). He fell asleep like that but I'm afraid that if he spits up (It's more like Projectile vomiting an ounce or two of milk) and can't get his nose and mouth out of the way. Should I turn him over? I'm going to be up all night just worrying about it! His brother is not getting his new bed til Saturday or Sunday so I have to do something in the mean time to protect him. Any suggestions?