I've urinated a little during sleep. 4 days already, Ever since my older sister started staying in my bed with me. I don't have any dreams ?
First, make sure you don't have a urinary tract infection by seeing your doctor.
Having another person in bed with you is difficult; you may not want to get up to urinate and wake your sister so your bladder overflows and causes the leakage at night.
It sounds as though there may possibly be some complicated family dynamics. Talking to a doctor about these issues may be very helpful.