I'm thoroughly talked out with my dd (who is nearly four). She did not have much to say until she was 2, and I was even a bit worried about her. Then she started talking seriously, and of course initially I was thrilled. Now it's like, 'please just pipe down a minute while Mummy changes lanes on the freeway?' 'How about a bit of shoosh while I write this email to my boss?" 'No, sorry, I really don't know WHY cars aren't alive' (well I do know, obviously, but I'm so exhausted with explaining things. At first it was fun, now it's really,really wearing sometimes). Recently I saw an ENT specialist because of persistent laryngitis. He told me to 'talk as little as possible' because I have nodules on my larnyx and there is no cure, as such, except for resting one's voice. I couldn't help but burst out laughing: I croaked at him 'my daughter is nearly four and she's not about to let me "rest my voice", believe you me!' He had kids too, so could see the point. And it's probably not dd's fault anyway: over the last six months I was doing pretty intensive teaching, only one day a week but I had to lecture for two hours straight and then do three back-to-back tutorials.
Gee, it gets tedious. But it sure beats having a child with speech difficulties - then you'd be worried as well as worn out.