me and this girl i like both had the same dreem on the same night she likes me 2 the dreem was about us goin on holiday together does this mean were compatible?

Share your dreams but not your fantasies….it can get messy.
Especially when they involve chainsaws, mutated reptiles and amputations.

If that girl was a friend to begin with I'd say you have a good chance of asking her to go along for the holiday.

I sometimes have the same dreams as my sister.

Are you sure it REALLY was a dream?

First of all, it wasn't the same dream - just vaguely similar. But if you and her both like each other enough to have the "same" dream, then, by all means, ask her out.