Can Grateful be "not so great"?

Every once in awhile, I get a "Things that make you go Hmmm" moment that can throw me for a loop, so I thought I'd share my latest, with hopes that maybe you'll have some words of wisdom to share:

Is it possible to be Grateful & also at the same time, have a less than positive attribute, like Tiredness? Or does the sheer definition, or essence of, gratefulness insist that to be 'truly grateful' leaves no room for anything negative?

When in doubt, I've always been told to "look it up", so I went to Dictionary.com which defines Grateful like this:

grate·ful

adjective

1.	warmly or deeply appreciative of kindness or benefits received; thankful: I am grateful to you for your help.

2.	expressing or actuated by gratitude: a grateful letter.

3.	pleasing to the mind or senses; agreeable or welcome; refreshing: a grateful breeze.

Okay, so the definition basically says a feeling of well-being. That's pretty straight-forward.

So, how then can we, as parents, be grateful for our children, and at the same time be exhausted, or frustrated, or even sad or heart-broken, because of something they've done or are doing? Does that mean we're not truly grateful for them?

Talk about a puzzler! Can we ever achieve true gratefulness this side of heaven?
I'd love to hear your thoughts!

Blessings, friends! K~