My 16 month old is doing the same thing atm. Personally I have no problem with it, yet. I planned on demand feeding until she was 2, so I'm on my way. For a month there her demand was twice daily, now its around 4 times in 24 hours, so not too much, but more than before. I haven't had as much milk due to illness so maybe thats why she wants more.

If you are tired and need a break, maybe distraction is the way to go for a little while to lengthen the time between.

Goodluck!