Can anyone please help? I have 2 cats, both females and sisters. They are around 1 1/2 years old and I have had them since they were 6 weeks. I have had both of them spayed, but the problem is one of them is constantly meowing really loudly and constantly. Every night is the same thing and I don't know whats wrong with her. She's quite an affectionate cat, but doesn't like to sit with you for long, as soon as you pick her up she stops crying, lies with you for 5 mins then jumps down and starts again. Any help would be appreciated! Thank you