While it's polite, IMO, to include some form of greeting or other pleasantries, in any kind of asynchronous communication medium, I do not want to wake up to (o

While it's polite, IMO, to include some form of greeting or other pleasantries, in any kind of asynchronous communication medium, I do not want to wake up to (or come back from lunch to, or whatever) someone saying "Hey" or "Can I ask you something?" Chances are, by the time I've said "sure, go ahead", the person won't be there anymore, and then both of us just have to wait frustratingly.