Let me share you a scenario:
There is a girl in my office visiting a dermatologist for her ailments. I can wait upto morning to ask her the doctor's details but cannot control (It's 10:10 in the night). Anyways, I am not gonna visit the doctor now and she is not gonna refuse to share the number if I ask in the morning. But I cannot wait. Why? What this condition is called. How to come out of this unnecessary urge.