Can I use the word `lack` like this?
I lacked sleep.
Yes, lack means 'not enough of'

I lack money,

I lack sleep, and so on!
You lack understanding.
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Good example Maj!

How about - some people lack patience!
What if some people lack words to put their ideas across?
Then they should open a dictionary - however they may lack resources to buy one!
Students: We have free audio pronunciation exercises.
Wouldn't it be worse to lack support. It wasn't for lack of trying.
And we could go on and on...... lets stop here before it gets silly!

I don't feel like another 'what is life' post!