My baby is 3 months old and when he is sleeping his eyes are open may i know the reason why is this happen

A. it could be considered to be normal as per the age and according ddto the details you have mentioned if not associated with a.ny other problems repetitively,you should not worry it does not require any kind of treatment or medicine if you have any more doubt you can get examination done once by the doctor available nearby and get further guidance regarding this.