If you have a script for how the communication should progress, you can hand it to someone else (like a VA) in another timezone and they can do it as you sleep.
Secondly, if your text communication is similar to a 'conversation' or 'chatting' (conducted in real time), you can make it more asynchronous. Treat it like sending an email and include a lot more info/questions in each message. Possibly, your respondent will reply in the same manner. Just don't overwhelm them.
Secondly, if your text communication is similar to a 'conversation' or 'chatting' (conducted in real time), you can make it more asynchronous. Treat it like sending an email and include a lot more info/questions in each message. Possibly, your respondent will reply in the same manner. Just don't overwhelm them.