Baby wake up easily on a little noise

My baby girl is now 8 months old she’s wakes up very easily on a little sounds like door opening if i change my side on bed if tap water running or any thing little bit I’m doing she open her eyes 👀 & then went to sleep or sometimes she just wake up completely since birth she’s like this she just sleep in pain drop silent every time but when she get too tired of traveling etc then she don’t care about sound otherwise at home she does also if there’s no sound she sleep for a long time ...

why my baby is like this i see my friends baby sleep if talk do anything they don’t wake up but mine if i take breath she will wake up

Please tell me if this is something wrong with her or it’s just normal