Accidentally came in cage; while asleep

I semi-regularly self-lock for a couple of days. It's always been relatively easy for me to cum in my cage (by rubbing the head with one finger trough the bars, sometimes accompanied by a vibrator up my ass). But I could also just choose not to mastrubate this way while in chastity and I wouldn't cum. However, I locked myself again on Saturday, and tonight; the night from Sunday to Monday, so only the second night locked, I had a wet dream. I woke up and felt that there was cum so I came in my sleep. I don't think I've ever cum in my sleep before, certainly not as an adult. Now I don't know if I really wanna keep doing chastity, sure it prevents me from jerking off or having sex normally, but if it doesn't even prevent me from cumming (hell, from all I know now, it might even make it more likely for me to cum accidentally), I don't really see the point anymore. If anyone knows of anyway to make sure you don't cum in chastity I'd love to hear it, otherwise this is probably the end of my chastity journey; as I don't really see the point anymore.