PMP Exam Simulator

There are 45 team members located in California and New York on the project that you are managing. During the project, different conflicts arise and there are different techniques that you use to resolve them. When resolving conflicts, you are focused on the present rather than the past and you never choose one side over another. At the moment, there is a conflict between two team members. One of them is frustrated because his colleague in another state keeps messaging him at 5 am (local time). He is getting seemingly urgent requests when he is sleeping or just waking up, and he is sick of being bombarded with requests before he has even sat down at his desk. Which conflict resolution technique will have the least sustainable positive result?